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zonae |
1 definition found From Webster's Revised Unabridged Dictionary (1913) [web1913]: Zona \Zo"na\, n.; pl {Zon[ae]}. [L., a girdle. See {Zone}.] A zone or band; a layer. {Zona pellucida}. [NL.] (Biol.) a The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating stri[ae], 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.
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