[cas.ing] n (1791) 1: something that encases: material for encasing: as a: an enclosing frame esp. around a door or window opening b: a metal pipe used to case a well c: [4]tire
2. d: a membranous case for processed meat
2: a space formed between two parallel lines of stitching through at least two layers of cloth into which something (as a rod or string) may be inserted