/ Dictionary / Index P prehnite: Meaning and Definition of Find definitions for: prehn•ite Pronunciation: (prā'nīt, pren'īt), [key] — n. a mineral, hydrous calcium aluminum silicate, CaAlSiO(OH), occurring in light-green reniform aggregates or tabular crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. prehistory prehominid Related Content Daily Word Quiz: ephemeral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language