hormone UK /ˈhɔːməʊn/US /ˈhoɹmoʊn/noun 4verb 1forms 3 noun4 •Any substance produced by one tissue and conveyed by the bloodstream to another to effect physiological activity.Interfemale dominance may be facilitated by female sex hormones as well as adrenal testosterone... — 1998 •A synthetic compound with the same activity.Tumours of the adrenal cortex which secreted feminizing hormones […] — 1962 •Any similar substance in plants. •[usually plural] (informal) Sex hormones, as used in hormone replacement therapy for transgender or intersex people.I'm going to be going to slightly higher doses of hormones soon. verb1 •(informal) To treat with hormones. formshormoned · hormoning · hormones