/ Dictionary / Index A apophyllite: Meaning and Definition of Find definitions for: a•poph•yl•lite Pronunciation: (u-pof'u-līt", ap"u-fil'īt), [key] — n. a hydrous potassium and calcium silicate mineral occurring in white crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. apophyge apophysis Related Content Daily Word Quiz: kiln Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language