/ Dictionary / Index P pentomic: Meaning and Definition of Find definitions for: pen•tom•ic Pronunciation: (pen-tom'ik), [key] — adj. Mil. pertaining to or characterizing the organization of an army division into five groups, each with supporting units, geared to maneuver in keeping with the requirements of atomic warfare. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentolite pentosan Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language