/ Dictionary / Index P pilum: Meaning and Definition of Find definitions for: pi•lum Pronunciation: (pī'lum), [key] — pl. -la a javelin used in ancient Rome by legionaries, consisting of a three-foot-long shaft with an iron head of the same length. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pilule Pilumnus Related Content Daily Word Quiz: jaundice Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language