VASODILATOR
vasodilator, vasodilative
(noun) a drug that causes dilation of blood vessels
Source: WordNet® 3.1
Etymology
Noun
vasodilator (plural vasodilators)
(pharmacology) A drug or chemical agent that causes dilation of the blood vessels thereby reducing blood pressure.
Source: Wiktionary
Vas`o*di*lat"or, a.Etym: [L. vas a vessel + dilator.] (Physiol.)
Definition: 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.
Source: Webster’s Unabridged Dictionary 1913 Edition