VASOCONSTRICTORAn agent that constricts the blood vessels.
VASODILATORAn agent that dilates the blood vessels.
VERMICIDEA drug that expels worms without necessarily killing them.
VESICANTA blistering drug or agent.
VESICATIONThe process of blistering.
VESICLEA small blister.
VIRULENCEThe degree of pathogenicity of a microorganism or its ability to
invade the tissues of the host.
WATERSAqueous solutions of volatile substances.