anoxia Syllabification: (an·ox·i·a)Pronunciation: /aˈnäksēə/Definition of anoxia noun technical an absence of oxygen. Medicine an absence or deficiency of oxygen reaching the tissues; severe hypoxia. Derivatives anoxicPronunciation: /-sik/ adjective Origin: 1930s: from an-1 + ox(ygen) + -ia1anoxia in other Oxford dictionaries Definition of anoxia in the British & World English dictionary