casementEtymologyReduced Anglicized form of Irish Mac Asmuint (“son of Asmund”), a personal name derived from Old Norse Asmundr, which is composed by the elements áss (“god”) + mundr (“protection”).casement means A surname from Irish. Lexicurio rates it Sui generis — a strength score of 88 out of 100.nameA surname from Irish.nounA window sash that is hinged on the side.“For at the window of my house I looked through my casement, and beheld among the simple ones, I discerned among the youths, a young man void of understanding.”A window having such sashes; a casement window.ᵂᵖ“Passing through Tokenhouse Yard, in Lothbury, of a sudden a casement violently opened just over my head, and a woman gave three frightful screeches, and then cried, ‘Oh! death, death, death!’ in a most inimitable tone, and which struck me with horror and a chillness in my very blood.”A casemate. Some writers and readers consider casement a catachresis when used in this sense.