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zona pellucida Syllabification: zo·na pel·lu·ci·da
Pronunciation: /ˌzōnə pəˈlo͞osədə/

Definition of zona pellucida in English:

noun (plural zonae pellucidaeˈzōˌnē pəˈlo͞osəˌdēˈzōˌnī pəˈlo͞osəˌdī)

Anatomy & Zoology
The thick transparent membrane surrounding a mammalian ovum before implantation.
Example sentences
  • At this stage the embryo releases itself from the zona pellucida still surrounding it, and implants into the uterine wall.
  • The embryo must hatch out of the zona pellucida prior to implantation into the uterine wall.
  • The secondary oocyte and the polar body remain surrounded by the zona pellucida and the cumulus oophorus.


Mid 19th century: from Latin, literally 'pellucid girdle'.

Definition of zona pellucida in:

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