/ Dictionary / Index P proleg: Meaning and Definition of Find definitions for: pro•leg Pronunciation: (prō'leg"), [key] — n. one of the abdominal ambulatory processes of caterpillars and other larvae, as distinct from the true or thoracic legs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prole prolegomenon Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language