tropin in English dictionary tropin Meanings and definitions of "tropin" (biology) any of the trophic hormones; one that is secreted by an endocrine gland and targets another such gland alternative spelling of tropine noun (biology) any of the tropic hormones; one that is secreted by an endocrine gland and targets another such gland noun Alternative spelling of [i]tropine[/i] more Grammar and declension of tropin tropin ( plural tropins) tropin (plural tropins) more Sample sentences with "tropin" Declension Stem Try again Authors