/ Dictionary / Index P proa: Meaning and Definition of Find definitions for: pro•a Pronunciation: (prō'u), [key] — n. any of various types of Indonesian boats, esp. a swift Malay sailing boat built with the lee side flat and balanced by a single outrigger. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pro proabortion Related Content Daily Word Quiz: digression Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language