va·​so·​di·​la·​tion | \ˌvā-zō-dī-ˈlā-shən, -də-\
variants: or vasodilatation \ˌvā-​zō-​ˌdi-​lə-​ˈtā-​shən, -​ˌdī-​lə-​ \

Definition of vasodilation 

: widening of the lumen of blood vessels

Examples of vasodilation in a Sentence

Recent Examples on the Web

When your heart rate goes up, your blood vessels begin to expand (vasodilation) to pump more blood around your body. Jessica Cruel, SELF, "6 Ways Working Out Affects Your Skin," 27 July 2018 For decades to come, migraine pain would be blamed primarily on the dilation of blood vessels (vasodilation) in the brain. David Noonan, Scientific American, "New Nerve Drugs May Finally Prevent Migraine Headaches," 1 Dec. 2015

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'vasodilation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of vasodilation

1908, in the meaning defined above

History and Etymology for vasodilation

vaso(dilator) + dilation or dilatation

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Last Updated

23 Nov 2018

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The first known use of vasodilation was in 1908

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More Definitions for vasodilation


va·​so·​di·​la·​tion | \ˌvā-zo-dī-ˈlā-shən \
variants: or vasodilatation \-​ˌdil-​ə-​ˈtā-​shən, -​ˌdī-​lə-​ \

Medical Definition of vasodilation 

: widening of the lumen of blood vessels

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to make faulty or ineffective

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