gonadotrophinPronunciation: /ˌgəʊnadə(ʊ)ˈtrəʊfɪn/ (also gonadotropin /-ˈtrəʊpɪn, -ˈtrɒpɪn/)Definition of gonadotrophin noun Biochemistry any of a group of hormones secreted by the pituitary which stimulate the activity of the gonads. gonadotrophin in other Oxford dictionaries Definition of gonadotrophin in the US English dictionary