zonapellucida

zo·na pel·lu·ci·da (zōʹnə pə-lo͞oʹsĭ-də, pĕl-yo͞oʹ-) n.

The thick, solid, transparent outer membrane of a developed mammalian ovum. Also called oolemma.

  [New Latin zōna pellūcida: Latin zōna, belt, girdle + Latin pellūcida, feminine of pellūcidus, transparent.]

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