/ Dictionary / Index P permease: Meaning and Definition of Find definitions for: per•me•ase Pronunciation: (pûr'mē-ās", -āz"), [key] — n. Biochem. any of the proteins that mediate the transport of various molecules across biological membranes. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. permeant permeate Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language