/ Dictionary / Index P platy: Meaning and Definition of Find definitions for: plat•y Pronunciation: (plā'tē), [key] — plat•i•er, plat•i•est. (of an igneous rock) split into thin, flat sheets, often resembling strata, as a result of uneven cooling. plat•y Pronunciation: (plat'ē), [key] — pl. plat•y, plat•ys, plat•ies. platyfish. platy- Pronunciation: [key] a combining form meaning “flat,” “broad,” used in the formation of compound words: platyhelminth. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: platy (Thesaurus) Plattsburgh platycephalic Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language