/ Dictionary / Index A Alcor: Meaning and Definition of Find definitions for: Al•cor Pronunciation: (al-kôr'), [key] — Astron. Astron. a star, the fifth-magnitude companion of Mizar in the handle of the Big Dipper. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Alcon Alcoran Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language