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4 definitions found
zona
地帶
zo·na /ˈzonə/ 名詞
帶,區,帶狀皰疹
Zo·na n.; pl. Zonae 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 striae, 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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zona
n : (anatomy) any encircling or beltlike structure [syn: zone]