vasoconstriction Syllabification: (vas·o·con·stric·tion)Pronunciation: /ˌvāzōkənˈstrikSHən, ˌvasō-/Definition of vasoconstriction noun the constriction of blood vessels, which increases blood pressure. Derivatives vasoconstrictivePronunciation: /-ˈstriktiv/ adjective vasoconstrictorPronunciation: /-ˈstriktər/ noun vasoconstriction in other Oxford dictionaries Definition of vasoconstriction in the British & World English dictionary