Zona

noun

1. In anatomy, a zone, belt, or girdle, or part likened to a zone: chiefly used in human anatomy.
2. Herpes zoster (which see, under herpes).
3. A zone or band; a layer.
4. The zona radiata.
5. a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.