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Definitions for Atom

[1] Physics . the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element. an atom with one of the electrons replaced by some other particle: muonic atom; kaonic atom.
[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.
[5] the smallest quantity of an element that can take part in a chemical reaction this entity as a source of nuclear energy the power of the atom See also atomic structure
[6] any entity regarded as the indivisible building block of a theory
[7] the hypothetical indivisible particle of matter postulated by certain ancient philosophers as the fundamental constituent of matter See also atomism
[8] a very small amount or quantity; minute fragment to smash something to atoms ; there is not an atom of truth in his allegations

Words related to Atom

speck, morsel, minimum, whit, mote, scrap, modicum, shred, tittle, iota, jot, trace, fragment, spot, scintilla, molecule, bit, mite, smidgen, crumb

Words nearby Atom

atmospherium, atn, atna, ato, atoll, atom, atom bomb, atom smasher, atom trap, atom-bomb, atomic

Origin of Atom

1350–1400; Middle English attomos, athomus < Latin atomus < Greek átomos, noun use of átomos undivided, equivalent to a- a-6 + tomós divided, verbid of témnein to cut

Other words from Atom

a•tom′ ic (ə-tŏm′ ĭk ) adj.

Word origin for Atom

C16: via Old French and Latin, from Greek atomos (n), from atomos (adj) that cannot be divided, from a- 1 + temnein to cut

Synonyms for Atom

bit, crumb, dot, fragment, grain, iota, jot, minimum, mite, modicum, molecule, morsel, mote, ounce, particle, scintilla, scrap, shred, smidgen, speck, spot, tittle, trace, whit