Vasodilator
Vasodilator , adjective
[Latin vas a vessel + dilator.]
(Physiology) Causing dilation or relaxation of the blood vessels; as, the vasodilator nerves, stimulation of which causes dilation of the blood vessels to which they go. These nerves are also called vaso-inhibitory, and vasohypotonic nerves, since their stimulation causes relaxation and rest.
Vasodilator , noun
[Latin vas a vessel + dilator.]
(Medicine & Physiology) A substance which causes dilation of blood vessels.