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17 results for: atom
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at·om 
Audio Help [at-uhm] Pronunciation Key
Audio Help [at-uhm] Pronunciation Key –noun
| 1. | Physics.
|
| 2. | Energy. this component as the source of nuclear energy. |
| 3. | a hypothetical particle of matter so minute as to admit of no division. |
| 4. | anything extremely small; a minute quantity. |
[Origin: 1350–1400; ME attomos, athomus < L atomus < Gk átomos, n. use of átomos undivided, equiv. to a- a-6 + tomós divided, verbid of témnein to cut]
] —Synonyms 4. shred, speck, scintilla, iota, jot, whit.
| Dictionary.com Unabridged (v 1.1) Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006. |
atom
To learn more about atom visit Britannica.com
| © 2008 Encyclopædia Britannica, Inc. |
at·om
Audio Help (āt'əm) Pronunciation Key
(click for larger image in new window) n.
[Middle English attome, from Latin atomus, from Greek atomos, indivisible, atom : a-, not; see a-1 + tomos, cutting (from temnein, to cut; see tem- in Indo-European roots).] |
| The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2006 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
atom
1477, as a hypothetical body, the building block of the universe, from L. atomus (especially in Lucretius), from Gk. atomos "uncut," from a- "not" + tomos "a cutting," from temnein "to cut." An ancient term of philosophical speculation (in Leucippus, Democritus), revived 1805 by British chemist Dalton. Atomic is from 1678 as a philosophical term; scientific sense dates from 1811. Atomic energy first recorded 1906; atomic bomb first recorded 1914 in writings of H.G. Wells, who thought of it as a bomb "that would continue to explode indefinitely." Atom bomb is from 1945; Atomic Age is from 1945.
"When you can drop just one atomic bomb and wipe out Paris or Berlin, war will have become monstrous and impossible." [S. Strunsky, "Yale Review," January 1917]Atomize "reduce a liquid to a fine mist" is from 1865; sense of "to destroy with atomic weapons" is from 1945.
| Online Etymology Dictionary, © 2001 Douglas Harper |
| atom | |
noun | |
| 1. | (physics and chemistry) the smallest component of an element having the chemical properties of the element |
| 2. | (nontechnical usage) a tiny piece of anything |
| WordNet® 3.0, © 2006 by Princeton University. |
atom1 [ˈӕtəm] noun
the smallest part of an element
atom2 [ˈӕtəm] noun
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anything very small
Example: There's not an atom of truth in what she says.
See also: atom(ic) bomb, atomic energy, atomic powerExample: There's not an atom of truth in what she says.
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| Kernerman English Multilingual Dictionary (Beta Version), © 2000-2006 K Dictionaries Ltd. |
| atom
Audio Help (āt'əm) Pronunciation Key
The smallest unit of an element, consisting of at least one proton and (for all elements except hydrogen) one or more neutrons in a dense central nucleus, surrounded by one or more shells of electrons. In electrically neutral atoms, the number of protons equals the number of electrons. Atoms remain intact in chemical reactions except for the removal, transfer, or exchange of certain electrons. Compare compound. See also ion, isotope, orbital. |
| The American Heritage® Science Dictionary Copyright © 2002 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
atom
A unit of matter; the smallest unit of a chemical element. Each atom consists of a nucleus, which has a positive charge, and a set of electrons that move around the nucleus. (See Bohr atom.)
Note: Atoms link together to form molecules.
[Chapter:] Physical Sciences and Mathematics
| The American Heritage® New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved. |
t- A unit of matter, the smallest unit of an element, having all the characteristics of that element and consisting of a dense, central, positively charged nucleus surrounded by a system of electrons. The entire structure has an approximate diameter of 10-8 centimeter and characteristically remains undivided in chemical reactions except for limited removal, transfer, or exchange of certain electrons.
- This unit regarded as a source of nuclear energy.
- A part or particle considered to be an irreducible constituent of a specified system.
- The irreducible, indestructible material unit postulated by ancient atomism.
- An extremely small part, quantity, or amount.
a·tom
ic (
-t
m
k) adj.
| The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. |
Main Entry: at·om
Pronunciation: 'at-&m
Function: noun
: the smallest particle of an element that can exist either alone or in combination
—atom·ic /&-'täm-ik/ adjective —atom·i·cal·ly /-i-k(&-)lE/ adverb
| Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc. |
Atom
At"om\, n. [L. atomus, Gr. ?, uncut, indivisible; 'a priv. + ?, verbal adj. of ? to cut: cf. F. atome. See Tome.]1. (Physics) (a) An ultimate indivisible particle of matter. (b) An ultimate particle of matter not necessarily indivisible; a molecule. (c) A constituent particle of matter, or a molecule supposed to be made up of subordinate particles. Note: These three definitions correspond to different views of the nature of the ultimate particles of matter. In the case of the last two, the particles are more correctly called molecules. --Dana. 2. (Chem.) The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule. 3. Anything extremely small; a particle; a whit. There was not an atom of water. --Sir J. Ross.| Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. |
Atom
At"om\, v. t. To reduce to atoms. [Obs.] --Feltham.| Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. |
Atom
Chem"is*try\ (k[e^]m"[i^]s*tr[y^]; 277), n. [From Chemist. See Alchemy.]1. That branch of science which treats of the composition of substances, and of the changes which they undergo in consequence of alterations in the constitution of the molecules, which depend upon variations of the number, kind, or mode of arrangement, of the constituent atoms. These atoms are not assumed to be indivisible, but merely the finest grade of subdivision hitherto attained. Chemistry deals with the changes in the composition and constitution of molecules. See Atom, Molecule. Note: Historically, chemistry is an outgrowth of alchemy (or alchemistry), with which it was anciently identified. 2. An application of chemical theory and method to the consideration of some particular subject; as, the chemistry of iron; the chemistry of indigo. 3. A treatise on chemistry. Note: This word and its derivatives were formerly written with y, and sometimes with i, instead of e, in the first syllable, chymistry, chymist, chymical, etc., or chimistry, chimist, chimical, etc.; and the pronunciation was conformed to the orthography. Inorganic chemistry, that which treats of inorganic or mineral substances. Organic chemistry, that which treats of the substances which form the structure of organized beings and their products, whether animal or vegetable; -- called also chemistry of the carbon compounds. There is no fundamental difference between organic and inorganic chemistry. Physiological chemistry, the chemistry of the organs and tissues of the body, and of the various physiological processes incident to life. Practical chemistry, or Applied chemistry, that which treats of the modes of manufacturing the products of chemistry that are useful in the arts, of their applications to economical purposes, and of the conditions essential to their best use. Pure chemistry, the consideration of the facts and theories of chemistry in their purely scientific relations, without necessary reference to their practical applications or mere utility.| Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. |
Atom
Mol"e*cule\, n. [Dim. fr. L. moles a mass: cf. F. mol['e]cule. See 3d Mole.]1. One of the very small invisible particles of which all matter is supposed to consist. 2. (Physics) The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state. 3. (Chem.) A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state; as, a molecule of water consists of two atoms of hydrogen and one of oxygen. Cf. Atom.| Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. |
Atom
Tome\, n. [F. tome (cf. It., Sp., & Pg. tomo), L. tomus, fr. Gr. ? a piece cut off, a part of a book, a volume, akin to ? to cup, and perhaps to L. tondere to shear, E. tonsure. Cf. Anatomy, Atom, Entomology, Epitome. ] As many writings as are bound in a volume, forming part of a larger work; a book; -- usually applied to a ponderous volume. Tomes of fable and of dream. --Cowper. A more childish expedient than that to which he now resorted is not to be found in all the tomes of the casuists. --Macaulay.| Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc. |
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