Quiz: Remember the definition of mal de mer?
early 14c., from French créneler, from crénelé (12c.); see crenel. Sometimes also crenellate; the double -l- seems to be from a presumed Latin *crenella as a diminutive of crena. Related: Crenelated (1823), also crenellated; crenellation (1849). Earlier formes of the past participle adjective included carneled.