Main Entry: vi·tel·lo·gen·in

Pronunciation: \vī-ˌte-lō-ˈje-nən\

Function: noun

Etymology: probably from vitellogenesis + ¹-in

Date: 1971

: a precursor protein of egg yolk normally in the blood or hemolymph only of females that is used as a biomarker in vertebrates of exposure to environmental estrogens which stimulate elevated levels in males as well as females