noun

1. a loose, gownlike garment worn by men and women in ancient Greece and Rome
2. a blouselike garment extending to the hips or lower, usually gathered at the waist, often with a belt
3. Chiefly Brit. a short coat forming part of the uniform of soldiers, policemen, etc.
4. a vestment worn over the alb, as formerly by a subdeacon, or by a bishop under the dalmatic
5. a natural covering of a plant, animal, etc.

Etymology: L tunica < *ktunica, of Sem orig. (prob. via Punic), as in Aram ktūnā, Phoen ktn, garment worn next to the skin (> Gr chitōn)