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Definition of Zona pellucida
1. Noun. 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.
Definition of Zona pellucida
1. Noun. (anatomy) A glycoprotein membrane surrounding the plasma membrane of an oocyte ¹
¹ Source: wiktionary.com
Medical Definition of Zona pellucida
1.