zona pellucida

American  

[zoh-nuh puh-loo-si-duh, pel-yoo-] / ˈzoʊ nə pəˈlu sɪ də, pɛlˈyu- /

noun

Anatomy.

plural

zonae pellucidae

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

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Etymology

Origin of zona pellucida

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.

From Nature

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

From The Verge

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.

From Science Magazine

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

From Forbes

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

From Washington Times