| NOUN | body | zona pellucida | thick membrane around the mammalian ovum |
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| Meaning | 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. | |
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| Broader | zone, zona | (anatomy) any encircling or beltlike structure |
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