endocrine UK /ˈɛndə(ʊ)kɹaɪn/US /ˈɛnd.oʊ.kɹɪn/adjective 2noun 2forms 1 adjective2 •Producing internal secretions that are transported around the body by the bloodstream. •Pertaining to the endocrine glands or their secretions. noun2 •An endocrine gland. •The secretion of an endocrine gland. formsendocrines