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Atom

see synonyms of atom

Noun

1. atom

(physics and chemistry) the smallest component of an element having the chemical properties of the element

2. atom, corpuscle, molecule, mote, particle, speck

(nontechnical usage) a tiny piece of anything

WordNet Lexical Database for English. Princeton University. 2010.

Atom

see synonyms of atom
noun
1. 
a. 
the smallest quantity of an element that can take part in a chemical reaction
b. 
this entity as a source of nuclear energy
the power of the atom
See also atomic structure
2. 
any entity regarded as the indivisible building block of a theory
3. 
the hypothetical indivisible particle of matter postulated by certain ancient philosophers as the fundamental constituent of matter
See also atomism
4. 
a very small amount or quantity; minute fragment
to smash something to atoms
there is not an atom of truth in his allegations

Collins English Dictionary. Copyright © HarperCollins Publishers

Atom

see synonyms of atom
noun
1.  Obsolete
any of the indivisible particles postulated by philosophers as the basic component of all matter
2. 
a tiny particle of anything; jot
3.  Chemistry and Physics
any of the smallest particles of an element that combine with similar particles of other elements to produce compounds: atoms combine to form molecules, and consist of a complex arrangement of electrons revolving about a positively charged nucleus containing (except for hydrogen) protons and neutrons and other particles

Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by Houghton Mifflin Harcourt. All rights reserved.

Atom

see synonyms of atom
n.
1.
a. A part or particle considered to be an irreducible constituent of a specified system.
b. The irreducible, indestructible material unit postulated by ancient atomism.
2. An extremely small part, quantity, or amount.
3. Physics & Chemistry
a. The smallest unit of an element, having all the characteristics of that element and consisting of a very small and dense central nucleus containing protons and neutrons, surrounded by one or more shells of orbiting electrons. Atoms remain undivided in chemical reactions except for the donation, acceptance, or exchange of valence electrons.
b. This unit regarded as a source of nuclear energy.

The American Heritage ® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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