neovascularization
noun
neo·vas·cu·lar·i·za·tion
variants:
also British neovascularisation \ -ˌvas-kyə-lə-rə-ˈzā-shən 
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Medical Definition of neovascularization
: vascularization especially in abnormal quantity (as in some conditions of the retina) or in abnormal tissue (as a tumor)