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atom

atom is defined in Webster's Unabridged Dictionary (1913) with 3 senses. The full text of each entry is reproduced verbatim below.

Definitions

  1. 1.(Chem.) The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
  2. 2.Anything extremely small; a particle; a whit. There was not an atom of water. Sir J. Ross.
  3. 3.To reduce to atoms. [Obs.] Feltham.

Source: Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).

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