/ Dictionary / Index C causist: Meaning and Definition of Find definitions for: caus•ist Pronunciation: (kô'zist), [key] — n. a person who supports or defends a cause, esp. a social cause. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. causey caustic Related Content Daily Word Quiz: blithesome Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language