zona

Noun
  1. (anatomy) any encircling or beltlike structure (synset 105618817)
    referred to in: anatomy, general anatomy - the branch of morphology that deals with the structure of animals
    is a type of: anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing and its construction and arrangement
    subtypes:
    • 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
    same as: zone

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