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’-)
The thick solid transparent outer membrane of a developed mammalian ovum. Also called oolemma.

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