/ Dictionary / Index E Euclid: Meaning and Definition of Find definitions for: Eu•clid Pronunciation: (y'klid), [key] — n. fl. c300 b.c., Greek geometrician and educator at Alexandria. a city in NE Ohio, near Cleveland. 59,999. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: euclid (Thesaurus) euclase Euclidean 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