Zona

n.

1.

A zone or band; a layer. Zona pellucida a - (Biol.) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striæ, and corresponds to the cell wall of an ordinary cell. See Ovum, and Illust. of Microscope. b - The zona radiata. Zona radiata (Biol.) a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.

Noun

1.

zona - (anatomy) any encircling or beltlike structure Synonyms: zone

anatomical structure, anatomy, bodily structure, body structure, complex body part, general anatomy, structure, zona pellucida, zone, zonula, zonule