Emily Dickinson Lexicon

AT'OM, n. [Gr. ατομος; L. atomus; from α, not, and τεμνω, to cut.]

1. A particle of matter so minute as to admit of no division. Atoms are conceived to be the first principles or component parts of all bodies. – Quincy.
2. The ultimate or smallest component part of a body. – Chimistry.
3. Any thing extremely small. – Shak.