vasodilation
noun
va·so·di·la·tion
ˌvā-zō-dī-ˈlā-shən
-də-
variants
or vasodilatation
ˌvā-zō-ˌdi-lə-ˈtā-shən
-ˌdī-lə-
: widening of the lumen of blood vessels
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Merriam-Webster unabridged
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