A covering, esp. a natural covering, integument; skin, membrane, slough (of a serpent).

Used by Trevisa to translate Latin tunica, as a coat of an artery, and of the eye, and retained in this sense in the later versions of Bartholomew.

= pellicle, n.

transferred. A natural covering or integument. Physiology. A membrane or other structure investing or lining an organ of an animal body (as the arac…

A small or thin skin; a fine sheet or layer covering a surface or (occasionally) enclosing a cavity; a membrane, a cuticle, a film.

Chiefly Biology. A layer or covering on an outer surface, esp. of the body or part of the body of an organism. Occasionally also: an inner layer or…

Something that serves to cover; a covering, coating, envelope, investment, integument. Natural History and Anatomy. The natural covering of the…

Defensive covering or coating.

That with which anything is covered, enclosed, or clothed; a covering, investment, coating. spec. The natural covering or investment of the body, or…

Applied variously to differentiated external structures in a plant or animal body, or organ. gen.

Zoology and Anatomy. In various animals: a part of the body serving as a sheath or cover. Obsolete.

Anatomy and Zoology. A small sheath-like or sac-like structure, esp. in a membrane. Obsolete.

transferred. Applied to various kinds of sheath or integument; a cocoon, etc. Obsolete.

A sheath-like covering. Applied to various animal and vegetable structures. Anatomy. The connective tissue covering which closely invests a part or…

Applied to similar parts of other organisms.

Zoology. A sheath resembling the ocrea of a plant; spec. the boot (boot, n.3 6f) of a bird. Obsolete. rare.

Anatomy. = tunic, n. 4a in various modern Latin collocations, as tunica adventitia, an outer sheath, esp. of a blood vessel; tunica albuginea, a…