/ Dictionary / Index E Euclidean: Meaning and Definition of Find definitions for: Eu•clid•e•an Pronunciation: (y-klid'ē-un), [key] — adj. of or pertaining to Euclid, or adopting his postulates. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: euclidean (Thesaurus) Euclid Euclidean algorithm Related Content Daily Word Quiz: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language