The Collaborative International Dictionary of English v.0.48:
Vascularity \Vas`cu*lar"i*ty\ (v[a^]s`k[-u]*l[a^]r"[i^]*t[y^]), n.; pl. Vascularities (v[a^]s`k[-u]*l[a^]r"[i^]*t[i^]z). (Biol.) The quality or state of being vascular. [1913 Webster]WordNet (r) 3.0 (2006):
vascularity n 1: the property being vascular; "a prominent vascularity"