Atom Definition

ătəm
atoms
noun
atoms
Any of the indivisible particles postulated by philosophers as the basic component of all matter.
Webster's New World
The irreducible, indestructible material unit postulated by ancient atomism.
American Heritage
A tiny particle of anything; jot.
Webster's New World
An extremely small part, quantity, or amount.
American Heritage
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
Antonyms:
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idiom
the atom
  • nuclear energy
Webster's New World

Other Word Forms of Atom

Noun

Singular:
atom
Plural:
atoms

Idioms, Phrasal Verbs Related to Atom

  • the atom

Origin of Atom

  • Middle English attome from Latin atomus from Greek atomos indivisible, atom a- not a–1 tomos cutting (from temnein to cut tem- in Indo-European roots)

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Middle French atome, from Latin atomus (“smallest particle”), from Ancient Greek ἄτομος (atomos, “indivisible”), from ἀ- (a-, “not”) + τέμνω (temnō, “I cut”).

    From Wiktionary

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