casing

nouns

the housing or outer covering of something
"the clock has a walnut case"
case, casing, shell
is derived from
case
the outermost covering of a pneumatic tire
casing
is a part of
a tire made of reinforced rubber and filled with compressed air; used on motor vehicles and bicycles etc
pneumatic tire, pneumatic tyre
is a type of (narrower)
an artifact that covers something else (usually to protect or shelter or conceal it)
covering
the enclosing frame around a door or window opening
"the casings had rotted away and had to be replaced"
case, casing