/ Dictionary / Index E end member: Meaning and Definition of Find definitions for: end' mem"ber Pronunciation: [key] — Mineral. Mineral. either of two pure compounds occurring in various proportions in a series of solid solutions that comprises a mineral group. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. end matter end mill Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language