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A hormone secreted by or acting on a part of the nervous system.
(Biochemistry) a hormone, such as noradrenaline, oxytocin, or vasopressin, that is produced by specialized nervous tissue rather than by endocrine glands
neu•ro•hor•mone(ˌnʊər oʊˈhɔr moʊn, ˌnyʊər-)
any of various substances, as antidiuretic hormone, formed in the nervous system and delivered to an effector organ through blood circulation.