We don't have synonyms for tropin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tropic, tropia and atropin.
(n) :
(biology) any of the tropic hormones; one that is secreted by an endocrine gland and targets another such gland
(n) :
Alternative spelling of tropine. [(organic chemistry) A poisonous alkaloid (3-endo)-8-methyl-8-azabicyclo[3.2.1]octan-3-ol obtained by the hydrolysis of atropine]
(n) :
(biology) any of the tropic hormones; one that is secreted by an endocrine gland and targets another such gland
(n) :
Alternative spelling of tropine. [(organic chemistry) A poisonous alkaloid (3-endo)-8-methyl-8-azabicyclo[3.2.1]octan-3-ol obtained by the hydrolysis of atropine]