Cas"ing (?), n.
1.
The act or process of inclosing in, or covering with, a case or thin substance, as plaster, boards, etc.
2.
An outside covering, for protection or ornament, or to precent the radiation of heat.
3.
An inclosing frame; esp. the framework around a door or a window. See Case, n., 4.
© Webster 1913.