Pronunciation: ˌ z ō -n ə -p ə - ' lü-s ə -d ə , -pel- ' yü-
Function: noun
Inflected Form: plural zo · nae pel · lu · ci · dae \ -( ˌ )n ē ⋯ -( ˌ )d ē , - ˌ n ī ⋯ - ˌ d ī \
Etymology: New Latin, transparent zone
Date: 1841
: the transparent more or less elastic noncellular outer layer or envelope of a mammalian ovum that is composed of glycoproteins