Pronunciation: (u-tom'ik), [key]
1. of, pertaining to, resulting from, or using atoms, atomic energy, or atomic bombs: an atomic explosion.
2. propelled or driven by atomic energy: an atomic submarine.
3. Chem.existing as free, uncombined atoms.
4. extremely minute. Also,a•tom'i•cal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.