/ Dictionary / Index C casque: Meaning and Definition of Find definitions for: casque Pronunciation: (kask), [key] — n. an open, conical helmet with a nose guard, commonly used in the medieval period. any helmet-shaped head covering. a process or formation on the head, resembling a helmet. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: casque (Thesaurus) Caspian Sea Cass Related Content Daily Word Quiz: dissonant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language