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1. causing dilation of blood vessels.
2. a nerve or agent that has this effect.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


Relating to reduced arteriolar tension or vasodilation.
[vaso- + G. hypo, under, + tonos, tone]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012