Vasoconstrictor
An agent that narrows blood-vessel openings, restricting the flow of blood through them.
 

Vasodilator
Causes relaxation of blood vessels which can reduce blood pressure.
 

Vermifuge
Expels, repels or destroys intestinal worms.
 

Vulnerary
A plant whose external application has a cleansing and healing effect on open wounds by protecting against infection and stimulating cell growth.