/ Dictionary / Index C claustral: Meaning and Definition of Find definitions for: claus•tral Pronunciation: (klô'strul), [key] — adj. cloistral; cloisterlike. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. clausthalite claustrophobe Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language