Noun | 1. | casing - the housing or outer covering of something; "the clock has a walnut case" boot - protective casing for something that resembles a leg grandfather clock, longcase clock - a pendulum clock enclosed in a tall narrow case housing - a protective cover designed to contain or support a mechanical component jacket - the tough metal shell casing for certain kinds of ammunition |
2. | casing - the outermost covering of a pneumatic tire covering - an artifact that covers something else (usually to protect or shelter or conceal it) pneumatic tire, pneumatic tyre - a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc | |
3. | casing - the enclosing frame around a door or window opening; "the casings had rotted away and had to be replaced" doorway, room access, door, threshold - the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close; "he stuck his head in the doorway" framework - a structure supporting or containing something window - a framework of wood or metal that contains a glass windowpane and is built into a wall or roof to admit light or air |