Hypertext Webster Gateway: "zona"

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.

From WordNet (r) 1.7 (wn)

zona
n : (anatomy) any encircling or beltlike structure [syn: {zone}]

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