Webster
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Webster’s Revised Unabridged Dictionary · 1913

Atom

At′om (ăt′ŭm), n. [L. atomus, Gr. ἄτομος, uncut, indivisible; ἀ priv. + τομός, verbal adj. of τέμνειν 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.

☞ 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.

At′om, v. t. To reduce to atoms. [Obs.] Feltham.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.