neurohypophysis Syllabification: (neu·ro·hy·poph·y·sis)Pronunciation: /ˌn(y)o͝orōhīˈpäfəsis/Definition of neurohypophysis noun (plural neurohypophyses /-ˌsēz/) Anatomy the posterior lobe of the hypophysis (pituitary gland), which stores and releases oxytocin and vasopressin produced in the hypothalamus. Derivatives neurohypophysealPronunciation: /-ˌpäfəˈsēəl/ adjective neurohypophysis in other Oxford dictionaries Definition of neurohypophysis in the British & World English dictionary