neurohormone Syllabification: (neu·ro·hor·mone)Pronunciation: /ˌn(y)o͝orōˈhôrˌmōn/Definition of neurohormone noun Physiology a hormone (such as vasopressin or norepinephrine) produced by nerve cells and secreted into the circulation. Derivatives neurohormonalPronunciation: /-hôrˈmōnəl/ adjective neurohormone in other Oxford dictionaries Definition of neurohormone in the British & World English dictionary