/ Dictionary / Index E euclase: Meaning and Definition of Find definitions for: eu•clase Pronunciation: (y'klās, -klāz), [key] — n. a rare green or blue mineral, beryllium aluminum silicate, BeAlSiO(OH), occurring in prismatic crystals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Eucken Euclid Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language