/ Dictionary / Index P plain suit: Meaning and Definition of Find definitions for: plain' suit" Pronunciation: [key] — Cards. Cards. a suit other than the trump suit. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plainstones plaint Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language