oxygen
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sɪ noun Chemistry.
a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. Symbol: O; atomic weight: 15.9994; atomic number: 8; density: 1.4290 g/l at 0°C and 760 mm pressure.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To oxygen
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Oxygen
is always a great word to know.
So is polymer. Does it mean:
| a compound of high molecular weight derived either by the addition of many smaller molecules, as polyethylene, or by the condensation of many smaller molecules with the elimination of water, alcohol, or the like, as nylon. |
| any of a group of carbohydrates, as sucrose or lactose, that yield monosaccharides on hydrolysis. |
Collins
World English Dictionary
oxygen (ˈɒksɪdʒən) ![[Click for IPA pronunciation guide]](http://static.sfdict.com/dictstatic/g/d/dictionary_questionbutton_default.gif) | |
| —n | |
| a. a colourless odourless highly reactive gaseous element: the most abundant element in the earth's crust (49.2 per cent). It is essential for aerobic respiration and almost all combustion and is widely used in industry. Symbol: O; atomic no: 8; atomic wt: 15.9994; valency: 2; density: 1.429 kg/m³; melting pt: --218.79°C; boiling pt: --182.97°C | |
| b. (as modifier): an oxygen mask | |
| oxygenic | |
| —adj | |
| oxygenous | |
| —adj | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
oxygen
gaseous chemical element, 1790, from Fr. oxygène, coined in 1777 by Fr. chemist Antoine-Laurent Lavoisier (1743-1794), from Gk. oxys "sharp, acid" (see acrid) + Fr. -gène "something that produces" (from Gk. -genes "formation, creation;" see
genus). Intended to mean "acidifying (principle)," from Fr. principe acidifiant. So called because oxygen was considered essential in the formation of acids. The element was isolated by Priestley (1774), who thought it an altered form of common air and called it dephlogisticated air.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary
oxygen ox·y·gen (ŏk'sĭ-jən)
n.
Symbol O
An element constituting 21 percent of the atmosphere by volume that occurs as a diatomic gas, O2, combines with most elements, is essential for plant and animal respiration, and is required for nearly all combustion. Atomic number 8; atomic weight 15.9994; melting point -218.8°C; boiling point -183.0°C; gas density at 0°C 1.429 grams per liter; valence 2.
A medicinal gas containing not less than 99.0 percent, by volume, of O2.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
| oxygen (ŏk'sĭ-jən) Pronunciation Key
Symbol O A nonmetallic element that exists in its free form as a colorless, odorless gas and makes up about 21 percent of the Earth's atmosphere. It is the most abundant element in the Earth's crust and occurs in many compounds, including water, carbon dioxide, and iron ore. Oxygen combines with most elements, is required for combustion, and is essential for life in most organisms. Atomic number 8; atomic weight 15.9994; melting point -218.4°C; boiling point -183.0°C; gas density at 0°C 1.429 grams per liter; valence 2. See Periodic Table. Our Living Language : In 1786, the French chemist Antoine Lavoisier coined a term for the element oxygen (oxygène in French). He used Greek words for the coinage: oxy- means "sharp," and -gen means "producing." Oxygen was called the "sharp-producing" element because it was thought to be essential for making acids. Lavoisier also coined the name of the element hydrogen, the "water-producing" element, in 1788. Soon after, in 1791, another French chemist, J. A. Chaptal, introduced the word nitrogen, the "niter-producing" element, referring to its discovery from an analysis of nitric acid. |
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
oxygen definition
An element, normally a gas, that makes up about one-fifth of the atmosphere of the Earth. Oxygen is usually found as a molecule made up of two atoms. Its symbol is O.
Note: When we breathe in oxygen, it is carried by the hemoglobin in our blood throughout the body, where it is used to generate energy by oxidation. (See respiration.)
Note: Oxygen is a waste product of green plants and photosynthesis.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
The nutrients feed algal blooms, which suck up the oxygen in the water.
With the infected red blood cells clogging up your small blood vessels, oxygen flow to your tissues decreases.
It also wanted to make sure there were no problems with oxygen levels.
Some patients with a collapsed lung need extra oxygen, which helps the air around the lung be reabsorbed more quickly.
Images for oxygen
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