casing
1. [ noun ] the outermost covering of a pneumatic tire
Related terms: covering pneumatic_tire
2. [ noun ] the housing or outer covering of something
Synonyms: case shell
Examples:

"the clock has a walnut case"

Related terms: housing gearbox boot jacket grandfather_clock
3. [ noun ] the enclosing frame around a door or window opening
Synonyms: case
Examples:

"the casings had rotted away and had to be replaced"

Related terms: framework window doorway
Similar spelling:   causing