The Oils and Plants Aromatherapy Glossary gives definitions of Aromatherapy and Herbal Terms.

Here are the results for the letter v

Vascular

Blood vessel-related

Vasoconstrictor

Contraction of blood vessels walls.

Vermifuge

Causing expulsion of intestinal worms

Viscosity

The resistance of a substance to flow. For example, water has a lower viscosity than molasses and flows more easily. Viscosity is related to the concept of shear force; it can be understood as the effect of different layers of the fluid exerting shearing force on each other, or on other surfaces, as they move against each other.

Vulnerary

Prevents tissue degeneration and arrests bleeding in wounds.