/ Dictionary / Index P polycrystalline: Meaning and Definition of Find definitions for: pol•y•crys•tal•line Pronunciation: (pol"ē-kris'tl-in, -īn", -ēn"), [key] — adj. (of a rock or metal) composed of aggregates of individual crystals. having or consisting of crystals that are variously oriented. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polycrystalline (Thesaurus) Polycrates polyculture Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language