Definitions for: Zona


[n] (anatomy) any encircling or beltlike structure



Webster (1913) Definition: 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.

Synonyms: zone

See Also: anatomical structure, bodily structure, body structure, complex body part, structure, zona pellucida, zonula, zonule

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Famous Quotes Containing Zona:


I want my testimony to stand on that point. But I would point out that Zona Research Inc. showed we have increased market share among business users, educational users, and government users over the past several months - and that's more recent than the IDC report.

-- Jim Barksdale (American Businessman)


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