p.pr. & ·vb.n. of case.
2. casing ·p.pr. & ·vb.n. of cash.
3. casing ·noun an inclosing frame; ·esp. the framework around a door or a window. ·see case, ·noun, 4.
4. casing ·noun an outside covering, for protection or ornament, or to precent the radiation of heat.
5. casing ·noun the act or process of inclosing in, or covering with, a case or thin substance, as plaster, boards, ·etc.