membrane

The ability to form an outer membrane around the organism that separates it from the external world.

Traveling through the bodily fluids of an infected person, Ebola enters through a mucous membrane or break in the skin.

Water has to be pushed through a semipermeable membrane that blocks the salt and other impurities from going through.

When they are done, the casing has transformed from translucent membrane into chewy, wrinkled coat.

You ever heard of something called membrane theory, detectives?

Small fragments of mucous membrane may be found, and when examined by a pathologist, may occasionally establish the diagnosis.

The damage which they do to the mucous membrane favors bacterial invasion.

It lives in the large intestine, especially the cecum, with its slender extremity embedded in the mucous membrane.

The thread was lodged in the perforated part, and consequently left in contact with the cellular membrane.

Of these coats he rightly supposes the outermost to be merely the epidermis of the middle membrane or testa.