casing

Definitions of casing
1

n the housing or outer covering of something

Synonyms:
case, shell
Types:
boot
protective casing for something that resembles a leg
gear box, gear case, gearbox
the shell (metal casing) in which a train of gears is sealed
jacket
the tough metal shell casing for certain kinds of ammunition
Type of:
housing
a protective cover designed to contain or support a mechanical component

n the outermost covering of a pneumatic tire

Type of:
covering
an artifact that covers something else (usually to protect or shelter or conceal it)

n the enclosing frame around a door or window opening

“the casings had rotted away and had to be replaced”
Synonyms:
case
Type of:
framework
a structure supporting or containing something

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