zona

Definitions of zona
1

n (anatomy) any encircling or beltlike structure

Synonyms:
zone
Types:
zona pellucida
thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
zonula, zonule
small beltlike zone
Type of:
anatomical structure, bodily structure, body structure, complex body part, structure
a particular complex anatomical part of a living thing

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