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.

{ A*tom"ic (&?;), A*tom"ic*al (&?;), } a. [Cf. F. atomique.] 1. Of or pertaining to atoms.