/ Dictionary / Index P plaice: Meaning and Definition of Find definitions for: plaice Pronunciation: (plās), [key] — pl. plaice. a European flatfish, Pleuronectes platessa, used for food. any of various American flatfishes or flounders. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plaice (Thesaurus) plaguy plaid Related Content Daily Word Quiz: miscreant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language