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Zona   /zˈoʊnə/   Listen
noun
Zona  n.  (pl. zonae)  A zone or band; a layer.
Zona pellucida. (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.
(b)
The zona radiata.
Zona radiata (Biol.), a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.






Collaborative International Dictionary of English 0.48








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"Zona" Quotes from Famous Books



... phase, yet differing from it, is the "Zona Libre" or Free Zone, 12 miles broad and 1,833 miles long, which forms the northern hem of Mexico from the Gulf to the Pacific. Here foreign goods pay only 18-1/2 per cent., formerly only 2-1/2 per cent., of the usual federal ...
— Influences of Geographic Environment - On the Basis of Ratzel's System of Anthropo-Geography • Ellen Churchill Semple



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