casing

(noun) the housing or outer covering of something. Synonyms: shell, case. Examples: "The clock has a walnut case."

(noun) the outermost covering of a pneumatic tire.

(noun) the enclosing frame around a door or window opening. Synonyms: case. Examples: "The casings had rotted away and had to be replaced."

(verb) look over, usually with the intention to rob. Synonyms: case. Examples: "They men cased the housed."

(verb) enclose in, or as if in, a case. Synonyms: encase, incase, case. Examples: "My feet were encased in mud."