/ Dictionary / Index M metaprotein: Meaning and Definition of Find definitions for: met•a•pro•tein Pronunciation: (met"u-prō'tēn, -tē-in), [key] — n. Biochem. a hydrolytic derivative of protein, insoluble in water but soluble in dilute acids or alkalis. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. metaplasm metapsychology Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language