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va·so·mo·tion .vā-zō-'mō-shən n alteration in the caliber of blood vessels
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n.
an increase or decrease in the diameter of blood vessels, particularly the arteries. See vasoconstriction, vasodilatation.
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vaso·mo·tion (va″zo-) (vas″o-moґshən) [vaso- + motion] change in the caliber of a vessel, especially of a blood vessel.Medical dictionary. 2011.