zona pellucida
noun
zo·na pel·lu·ci·da
ˌzō-nə-pə-ˈlü-sə-də
-pel-ˈyü-
plural zonae pellucidae
ˌzō-(ˌ)nē-pə-ˈlü-sə-(ˌ)dē
ˌzō-ˌnī-pə-ˈlü-sə-ˌdī,
-pel-ˈyü-
: the transparent more or less elastic noncellular outer layer or envelope of a mammalian ovum that is composed of glycoproteins
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Merriam-Webster unabridged
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