/ Dictionary / Index P phenocryst: Meaning and Definition of Find definitions for: phe•no•cryst Pronunciation: (fē'nu-krist, fen'u-), [key] — n. Petrol. any of the conspicuous crystals in a porphyritic rock. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. phenocopy phenogram Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language