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chemical

[kem-i-kuhl]

Example Sentences Origin

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noun

a substance produced by or used in a chemical process.

chemicals, Slang. narcotic or mind-altering drugs or substances.

adjective

of, used in, produced by, or concerned with chemistry or chemicals: a chemical formula; chemical agents.

used in chemical warfare: chemical weapons.

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Chemical is always a great word to know.

So is barracuda. Does it mean:

a treacherous, greedy person

having a pleasantly plump figure

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Origin:
1570–80; chemic + -al¹; replacing chimical chemic

Related forms

chem·i·cal·ly, adverb

non·chem·i·cal, adjective, noun

pre·chem·i·cal, adjective

pseu·do·chem·i·cal, adjective

sem·i·chem·i·cal, adjective

EXPAND

sem·i·chem·i·cal·ly, adverb

su·per·chem·i·cal, adjective, noun

su·per·chem·i·cal·ly, adverb

un·chem·i·cal, adjective

un·chem·i·cal·ly, adverb

COLLAPSE

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To chemical

Example Sentences

Chemical companies that make products as varied as fertilizer and industrial solvents are overseen by other agencies.

Department secretaries transcribed them while he pored over chemical journals and planned his next article.

Most countries have now agreed to give up using or storing chemical weapons.

EXPAND

Chemical companies that make products as varied as fertilizer and industrial solvents are overseen by other agencies.

Department secretaries transcribed them while he pored over chemical journals and planned his next article.

Most countries have now agreed to give up using or storing chemical weapons.

Weathering is the mechanical and chemical hammer that breaks down and sculpts the rocks.

In this age of looming bioterrorism, keeping chemical warfare vapors off of soldiers is a primary military concern.

The method may be harsh, but the yield is precious-the chemical biography of a cave bear.

For chemical control, use a selective postemergence herbicide labeled for dandelions in turf.

The scientists found that smaller golden orb spiders didn't produce the chemical because their webs were too thin to support ants.

Your task in the quiz is to match the chemical element to the product in which it is found.

The area of specialization is open and includes chemical education.

Bigger does not always mean better in chemical plant.

Chemical reactors are shrinking to notebook and even credit card size.

The chemical combo was nearly as effective in deterring mosquitoes as pools containing adult backswimmers.

The key is shifting the chemical world into the digital world.

For chemical control, use a pre-emergence product containing isoxaben.

In a tail wagging the dog reversal, researchers have found that simple chemical reactions can mix a solution.

Chemical reactions happen in mind-bogglingly short spans of time.

Louisiana officials are inspecting chemical plants for leaks.

Buying chemical weapons material through the mail is quick and easy.

Chemical fuel is out of the question-you could never store enough of it.

For chemical control, use a selective postemergence herbicide.

Chemical weapons have been an international taboo for decades.

The term covers a runaway nuclear chain reaction, not radioactive materials being involved in a chemical explosion.

One chemical is a testosterone derivative produced in men's sweat.

Chemical in urine alerts prey species to a nearby predator.

Chemical fixatives can pin down reproducing cells in flagrante delicto.

For chemical control, use a preemergence herbicide to prevent seedlings from becoming established in lawns and around ornamentals.

When this chemical reacts with amino acid compounds it detects fingerprints on paper.

If there was some other chemical drug it could probably be handled in the same fashion.

Plastic, he said, should be considered a new source of chemical pollution in the ocean.

But the ornamental value of chemical pigments, too, has stirred considerable interest.

Some have chipped varnish off the violins, hoping to discover a special chemical compound.

Or your plumber, pastor, and that quiet chemical engineer down the street.

The chemical company cuts loose employees for having illicit content in their e-mail.

If the number of cells in a culture changes after a sample is added, that suggests the chemical in question is bad for the liver.

The moss contains a special chemical that helps reindeer keep their body fluids warm.

Metabolites are the result of the body breaking down a chemical.

Chemical controls effective against adults include acephate and carbaryl.

The woman also had unknown chemical materials sealed in containers in her purse.

Ants solve their own version using chemical signals called pheromones.

These pioneers were attracted by unique ocean organisms with special chemical properties not seen on land.

Chemical herbicides can help you reestablish control over a lawn where weeds have gained the upper hand.

For over sixty years, the chemical parent of nylon has been made by a two-step process that generates tons of waste.

Handling the radioactive and chemical waste produced in the process adds significantly to the cost.

They have poor eyesight, and stalk prey using chemical receptors in their tongues and heat-sensors along the jaws.

Chemical controls include triforine and thiophanate-methyl.

Pig feed is high in a chemical called phytate, which swine excrete as phosphorus.

The other looks at how a brain chemical called serotonin regulates the patience of rats.

In fact there may be nothing unusual about his chemical profile.

Chemical controls against caterpillars include carbaryl and malathion.

He soon replaced that with a complicated chemical ampere-hour meter.

Carbaryl, diazinon, and malathion are effective chemical controls against caterpillars.

Using the results, researchers identify and quantify the chemical building blocks of the morsel's flavor.

If the problem is so severe that you must resort to chemical control, call in a professional to fumigate the soil.

For many reasons chemical experiments aren't as popular as they once were.

Because larvae are protected by leaf membranes, chemical controls are not effective.

Communities near chemical plants have been doing this effectively for years.

Chemical controls include chlorothalonil, triforine, and thiophanate-methyl.

For chemical control, you can use chlorothalonil in spring.

Chemical controls effective against adults include carbaryl and malathion.

Chemical controls include bait or meal containing metaldehyde or methiocarb.

Chemical controls include earwig bait, which usually contains carbaryl or propoxur.

For chemical control, place baited ant traps sold for indoor use in the garden.

Chemical controls effective against adult beetles include chlorpyrifos and diazinon.

Chemical controls may help if you spray when adult beetles are laying eggs in summer.

Carbaryl is an effective chemical control against adults.

For chemical control, you can use a pre-emergence herbicide containing trifluralin around ornamentals.

We have always tried our best to line our wooden veggie bed walls with some sort of barrier in case of chemical leeching.

Common garden pesticides that are highly toxic to bees include both organic and conventional chemical controls.

Several cosmetics makers are removing a chemical from nail polish that is suspected of interfering with the endocrine system.

Rats exposed to high levels of chemical pollutants in fish oil could not regulate fat properly.

Commonly seen on fruit trees, this problem has no chemical cure.

If you are new to hot tub maintenance, order a start-up chemical package that will have everything you need.

US scientists are developing an alternative coastal deterrent, based on chemical signals.

Smithson's formative years unfolded in the midst of unprecedented discovery, much of it directly connected to chemical advances.

Understanding arsenic's chemical characteristics helps to predict its toxicity and potential effects on aquatic and human life".

His book contains a lot of fascinating detail about the different physical, chemical and evolutionary processes at work.

Chemical that leaches from baby bottles and other plastic containers remains in the body longer than.

But sooner or later the heating and chemical alteration of the rock that is.

These products are derived from the chemical sources listed on the product label.

Obviously there was some chemical in the fabric of the suitcase that was causing.

These switches are set off by a chemical signal sprayed on genetically tinkered seed.

Chemical runoff from residential and farm products affects rivers, streams and even the ocean.

Unless air quality is degraded, chemical attack unlikely.

Molecules are constantly changing and rearranging their atoms in chemical reactions to form new molecules and compounds.

Once it had them, it already knew how to turn out chemical and biological warheads in months or weeks.

Chip-based spectroscopy may lead to portable chemical sensors, atomic clocks and quantum-powered information networks.

The newly discovered chemical reactions would allow.

There is some chemical that can get into groundwater and it's.

One way to identify a substance without resorting to fiddly chemical methods is to determine its density.

The trick to the wasp's subterfuge is the chemical weapons it brings to bear.

For more than a decade, scientists have known of about a thousand genes that code for odorant, or chemical.

But the slightest defect can lead to a disastrous uncontrolled chemical reaction.

When fresh air struck the flesh under the dropping, an odd chemical reaction took place that caused a poison to form in his skin.

They have conducted the largest clinical trial ever designed to compare talk therapy with chemical antidepressants.

Disinfectants made from everyday kitchen ingredients provide nontoxic and inexpensive alternatives to harsh chemical products.

The chemical building blocks that make plastics so versatile are the same components that might harm people and the environment.

Chemical tests of hair samples recently confirmed that the lions had eaten human flesh in the months before they were killed.

Nanotechnology could help futuristic battle suits protect troops from bullets and chemical weapons.

First, a specially shaped charge of chemical explosives surrounding a plutonium pit goes off.

Bacteria grow by using the chemical energy of reduced sulfur compounds, plentiful in the warm vent water.

The only thing organic chemical means is that it has carbon in.

Chemical lasers have not done too well int he last few decades.

There is ample chemical and microscopic proof of that".

The aerosols sprayed upward from sparkling wine have a different chemical signature than the wine itself.

It can be grown without chemical pesticides and fertilizers.

For chemical control, use a pre-emergence herbicide containing oryzalin or pendimethalin.

The compounds evaporate into the air through a series of chemical processes that result in especially reflective clouds.

But to do this they must overcome their disgust of creepy crawlies and their urge to obliterate them with chemical sprays.

Could this age-old chemical be harmful for you and.

Apparently, but only if they contain melanin, the chemical that serves as skin pigment in humans.

One way to lighten the payload is with a chemical laser that uses gas instead of liquid to store energy.

The direct cause is a chemical distress signal produced in skin that is damaged by another hazard of modern life: eczema.

Triclosan, an antibacterial chemical found in everyday.

The cause was the chemical compound lignin, which plants use to build themselves up.

Dyneema is not vulnerable to moisture damage because it has a particularly sturdy chemical backbone.

They have developed an industrial-scale solar-driven purification system that removes not only bugs but also chemical pollutants.

It's possible to remove tough, greasy stains with gentle products that do not contain harmful chemical detergents.

They will find use in wearable electronics, chemical sensors, skin for robots and innumerable.

There's a chocolate-colored tee with the molecule theobromine, the chemical that makes chocolate so fun.

Windows get dirty, but you don't need to reach for chemical cleaners to return them to a sparkling shine.

Arkansas deploys facilities built to detect chemical and biological weapons to keep tabs on ever-evolving synthetic pot products.

They are not a new synthetic chemical or compound made from petrochemicals.

But a chemical called primin, found on the hairs of its stems.

Because the wood is unadulterated, the tissues hold a chemical record of weather patterns during the period the tree lived.

There is little substantive difference in the chemical compositions of natural and artificial flavorings.

He wants people to adopt a frog and forget the widely used chemical controls.

Chemical compounds common to berries, tofu, tea and other foods can shore up memory and boost brainpower.

Purchasing green clothing reduces toxic chemical and dye exposure while lessening a family's carbon footprint.

At the cellular level, caffeine blocks the action of a chemical called.

Traces of the chemical are often found in mouse and human urine, leading.

Animals employ many kinds of disguises for self-protection, including chemical and acoustic mimicry of other species.

If chemical control is necessary, use a pre-emergence product.

However, this laboratory chemical is more or less a copy of a chemical that comes from the bark of a willow tree.

Organic produce, grown on farms that steer clear of typical pesticides and chemical fertilizers, is becoming increasingly popular.

Few scientific challenges are more complex than understanding the health risks of a chemical or drug.

Fuel cells create electricity from chemical reactions.

Chemical herbicides keep nature at bay for only so long: weeds inevitably develop resistance to the chemicals.

Love and obsessive-compulsive disorder could have a similar chemical profile.

Organic cotton is chemical and pesticide free, is less damaging agriculturally, and produces a strong and durable fiber.

COLLAPSE

Collins

World English Dictionary

chemical (ˈkɛmɪk^əl)

—n
1.	any substance used in or resulting from a reaction involving changes to atoms or molecules, especially one derived artificially for practical use

—*adj*
2.	of or used in chemistry: chemical balance
3.	of, made from, or using chemicals: chemical fertilizer

'chemically

—*adv*

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source

Etymonline

Word Origin & History

chemical

1576, from chemic "of alchemy" (a worn-down derivative of M.L. alchimicus; see alchemy) + -al (1).

American Heritage

Medical Dictionary

chemical chem·i·cal (kěm'ĭ-kəl)
adj.
Abbr. chem.

Of or relating to chemistry.
Of or relating to the properties or actions of chemicals.

A substance with a distinct molecular composition that is produced by or used in a chemical process.
A drug, especially an illicit or addictive one.

chem'i·cal·ly adv.

American Heritage

Science Dictionary

chemical

  (kěm'ĭ-kəl) Pronunciation Key
Adjective   Relating to or produced by means of chemistry.

Noun   A substance having a specific molecular composition, obtained by or used in a chemical process.

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Matching Quote

"We do not want actions, but men; not a chemical drop of water, but rain; the spirit that sheds and showers actions, countless, endless actions."

-Ralph Waldo Emerson

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