Zona pellucida
the transparent, noncellular layer surrounding the ovum of mammals, often having radial striations.
historical examples
foulis regards the zona pellucida as a product of the ovum and not of the follicle.
the works of francis maitland balfour, volume 1 francis maitland balfour
zona pellucida zona pel·lu·ci·da (pə-lōō’sĭ-də, pěl-yōō’-)
n.
the thick solid transparent outer membrane of a developed mammalian ovum. also called oolemma.
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