[vas-oh-dahy-ley-ter, -di-, -dahy-ley-, vey-zoh-]
noun Physiology, Pharmacology.
a nerve or drug that causes vasodilatation.

1880–85; vaso- + dilator Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
vasodilator (ˌveɪzəʊdaɪˈleɪtə)
1.  a drug, agent, or nerve that can cause dilatation (vasodilatation) of the walls of blood vessels
2.  causing vasodilatation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

vasodilator va·so·di·la·tor (vā'zō-dī-lā'tər, -dĭ-, -dī'lā-)
Something, such as a nerve or drug, that causes vasodilation. adj.
Producing vasodilation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
If you are not able to exercise, your doctor may give you a medicine called a vasodilator, which dilates your heart arteries.
Another simple, inorganic gas also acts as a vasodilator: hydrogen sulfide, the source of the smell of rotten eggs.
The gel's active ingredient, glyceryl nitrate, has been used for as a vasodilator for over a century.
Additional vasodilator mechanisms must therefore be involved.
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