integument

A natural outer covering or coat, such as the skin of an animal or the membrane enclosing an organ.

The outermost layer or layers of an ovule.

In general, a covering; that which covers or clothes.

Specifically That which naturally covers or invests any animal or vegetable body, as a skin, shell, case, crust, or rind; especially, a continuous investment or covering, as the cutaneous envelop or skin of an animal body, with or without its special appendages.

That which naturally invests or covers another thing, as the testa or the tegmen of a seed; specifically (Anat.), a covering which invests the body, as the skin, or a membrane that invests a particular part.