Dilation of blood vessels (especially the arteries)

WordNet Word definitions in WordNet
n. dilation of blood vessels (especially the arteries)

Wiktionary Word definitions in Wiktionary
n. dilation of the blood vessels

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
1896, from vasopressor , from vaso- , comb. form of Latin vas "container, vessel" (see vas ) + dilation .\nRelated: Vasodilator (1881).

Wikipedia Word definitions in Wikipedia
Vasodilation (or vasodilatation ) refers to the widening of blood vessels . It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins , large arteries , and smaller arterioles . The process is the opposite ...