The Collaborative International Dictionary of English v.0.48:

Vascularization \Vas`cu*lar*i*za"tion\
   (v[a^]s`k[-u]*l[~e]r*[i^]*z[=a]"sh[u^]n), n. (Physiol.)
   The process of becoming vascular, or the condition of being
   vascular; as, the vascularization of cartilege.
   [1913 Webster]

WordNet (r) 3.0 (2006):

vascularization
    n 1: the organic process whereby body tissue becomes vascular
         and develops capillaries [syn: vascularization,
         vascularisation]