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vascular composed of, containing, or having to do with tubes or ducts that carry a fluid, such as blood or lymph in animals or sap in plants, or with a system of such tubes or ducts.
vascular bundle in botany, an aggregate plant unit composed of strands of conductive and supportive tissue.
vas deferens the duct that carries sperm from the testicle to the ejaculatory duct of the penis.
vase an open container of glass, porcelain, pottery, or the like, usu. taller than it is wide, used as an ornament or to hold cut flowers.
vasectomy a surgical operation in which a male's sperm-carrying tube is cut and tied or removed, as a means of birth control.
Vaseline trademark for petrolatum.
vaso- blood vessel. [2 definitions]
vasoconstriction constriction or narrowing of a blood vessel or vessels, as in response to a nerve impulse.
vasoconstrictor a nerve or drug that causes constriction of the blood vessels. [2 definitions]
vasodilatation see vasodilation.
vasodilation dilation or widening of a blood vessel or vessels, as in response to a nerve impulse.
vasodilator a nerve or drug that causes dilation of the blood vessels. [2 definitions]
vasoinhibitor a drug or other agent that inhibits the action of the vasomotor nerves.
vasomotor controlling the width of blood vessels, as some nerves or certain drugs; causing vasoconstriction or vasodilatation.
vasopressin a hormone secreted by the posterior lobe of the pituitary gland which increases blood pressure by causing capillaries to constrict.
vasopressor causing a rise in blood pressure by constricting the blood vessels. [2 definitions]
vassal in the Middle Ages, one who was granted the use of land in return for allegiance and service to a feudal lord. [2 definitions]
vassalage the state or condition of being a vassal. [2 definitions]
vast immense in size or area. [3 definitions]
VAT abbreviation of "value-added tax," a sales tax paid on the value added to products and services at each stage of manufacturing and distribution.
vat a very large container, such as a barrel, tub, or tank, used for holding or storing liquids, esp. at stages in a manufacturing process. [2 definitions]