intravascular Syllabification: (in·tra·vas·cu·lar)Pronunciation: /ˌintrəˈvaskyələr/Definition of intravascular adjective Medicine & Biology situated or occurring within a vessel or vessels of an animal or plant, especially within a blood vessel or blood vascular system. Derivatives intravascularly adverb intravascular in other Oxford dictionaries Definition of intravascular in the British & World English dictionary