'Zona' definitions:

Definition of 'zona'

From: WordNet
noun
(anatomy) any encircling or beltlike structure [syn: zone, zona]

Definition of 'Zona'

From: GCIDE
  • Zona \Zo"na\, n.; pl. Zonae. [L., a girdle. See Zone.] A zone or band; a layer. [1913 Webster]
  • Zona pellucida. [NL.] (Biol.) (a) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striae, and corresponds to the cell wall of an ordinary cell. See Ovum, and Illust. of Microscope. (b) The zona radiata.
  • Zona radiata [NL.] (Biol.), a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only. [1913 Webster]

Words containing 'Zona'