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From The Collaborative International Dictionary of English v.0.44 [gcide]:
Zona \Zo"na\, noun; 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.
From WordNet (r) 2.0 [wn]:
zona
noun: (anatomy) any encircling or beltlike structure [syn: {zone}]
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