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Wikipedia
Usage examples of "pellucidum".
It was over a hundred times more likely that the equally charged diplodeviant sperm would lash its frenetic way through the zona pellucida and neutralize the inhibiting effect of the cortical granules.
But ever since Jerry Hall and Sandra Yee had shown in 1991 that a synthetic zona pellucida could be coated onto egg cells, human cloning had been theoretically possible.
This time the penetration was limited to the zona pellucida, sparing the oocyte's cell membrane, and instead of suction being applied, a tiny volume of fluid was introduced into what's known as the perivitelline space.
The only evidence of the cell's earlier rude aspiration from its developing follicle were the ragged remains of its corona radiata of granulosa cells adherent to the comparatively dense envelope called the zona pellucida.
Inexorably it closed in on the hapless, immobile gamete and indented the cell's zona pellucida.