zona pellucida

[zoh-nuh puh-loo-si-duh, pel-yoo-]

noun

Anatomy.

plural

zonae pellucidae 

1. the transparent, noncellular layer surrounding the ovum of mammals, often having radial striations.

Word History and Origins

Origin of zona pellucida¹

From New Latin, dating back to 1835–45; zone, pellucid

Example Sentences

White arrows point to the presumptive inner cell mass and a black arrow to a representative zona pellucida.

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These peptides make up what is called the "zona pellucida" — a sort of extracellular eggshell that surrounds the egg in a transparent layer.

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Hay’s team also showed that the same approach could be used to make female mice generate antibodies to the zona pellucida, a layer of proteins that surrounds egg cells.

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How relevant is zona pellucida thickness, cross referenced to age, stimulation protocol, and IVF cycle outcome history?

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The porcine zona pellucida, or PZP, vaccine has been used at 15 game parks in Africa, 250 zoos worldwide and elsewhere, he said.

Read more on Washington Times