zona

Definitions of zona
  1. noun
    (anatomy) any encircling or beltlike structure
    synonyms: zone
    see moresee less
    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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