noun ·see mantle, ·noun, 3 (a).
2. tunic ·noun ·same·as tunicle.
3. tunic ·noun a natural covering; an integument; as, the tunic of a seed.
4. tunic ·noun a membrane, or layer of tissue, especially when enveloping an organ or part, as the eye.
5. tunic ·noun an under-garment worn by the ancient romans of both sexes. it was made with or without sleeves, reached to or below the knees, and was confined at the waist by a girdle.
6. tunic ·noun any similar garment worm by ancient or oriental peoples; also, a common name for various styles of loose-fitting under-garments and over-garments worn in modern times by europeans and others.