tegument

A natural outer covering; an integument.

A cover; an envelop; a natural covering or protection of the body or a part of it; a tegmen or tegmentum.

Specifically— In zoology and anatomy, skin; the general covering of the body; the integument.

In entomology: A tegmen; the wing-cover or elytrum of orthopterous insects: an erroneous use, apparently by confusion with tegmen, 5.

Properly, the crust, or chitinous integument, of the body, as distinguished from the hairs, scales, etc., which may grow upon it.