zona pellucida


zo·​na pel·​lu·​ci·​da ˌzō-nə-pə-ˈlü-sə-də How to pronounce zona pellucida (audio)
plural zonae pellucidae ˌzō-(ˌ)nē-pə-ˈlü-sə-(ˌ)dē How to pronounce zona pellucida (audio)
: the transparent more or less elastic noncellular outer layer or envelope of a mammalian ovum that is composed of glycoproteins

Example Sentences

Recent Examples on the Web The morula’s outer membrane, the zona pellucida, was the same egg membrane taken from the cow. Amos Zeeberg (discover Web Editor), Discover Magazine, 15 July 2010

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'zona pellucida.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History


borrowed from New Latin, "transparent zone"

First Known Use

1841, in the meaning defined above

Time Traveler
The first known use of zona pellucida was in 1841

Dictionary Entries Near zona pellucida

Cite this Entry

“Zona pellucida.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/zona%20pellucida. Accessed 1 Feb. 2023.

Medical Definition

zona pellucida

zona pel·​lu·​ci·​da -pə-ˈlü-sə-də How to pronounce zona pellucida (audio)
: the transparent more or less elastic noncellular glycoprotein outer layer or envelope of a mammalian ovum often traversed by numerous radiating striae
Last Updated: - Updated example sentences
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