Atom

Webster's Dictionary of the English Language

·vt To reduce to atoms.

II. Atom ·noun An ultimate indivisible particle of matter.

III. Atom ·noun Anything extremely small; a particle; a whit.

IV. Atom ·noun An ultimate particle of matter not necessarily indivisible; a molecule.

V. Atom ·noun A constituent particle of matter, or a molecule supposed to be made up of subordinate particles.

VI. Atom ·noun The smallest particle of matter that can enter into combination; one of the elementary constituents of a molecule.