Meaning of ZONA
 WordNet Dictionary |
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| | Definition: | | [n] (anatomy) any encircling or beltlike structure |
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| | Synonyms: | | zone |
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| | See Also: | | anatomical structure, bodily structure, body structure, complex body part, structure, zona pellucida, zonula, zonule | |
| Products Dictionary |
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| | Definition: | | Zona
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| Webster's 1913 Dictionary |
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| | 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.
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