Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for atom from the 1913 edition of Webster's Revised Unabridged Dictionary. Define atom using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 6
3. A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.
4. The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.
Part of Speech: verb transitive
1. To reduce to atoms.
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