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Zo Zy
Zon Zoo

Zona

Noun, plural zonas or zonae or zonæ

1. A zone or band; a layer (wiktionary.org); A band or a layer surrounding a structure, for example, zona pellucida refers to the layer surrounding a mammalian ovum. (biology-online.org)

2. Any encircling or belt-like structure. (wordnetweb.princeton.edu)

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