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.
more about zona
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Lake Atitlan, Guatemala
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