Defn: Resection or excision of the vas deferens.
VASELINE Vas"e*line, n. Etym: [Said by the manufacturer to be derived from G. wasser water + Gr. 'e`laion olive oil.]
Defn: A yellowish translucent substance, almost odorless and tasteless, obtained as a residue in the purification of crude petroleum, and consisting essentially of a mixture of several of the higher members of the paraffin series. It is used as an unguent, and for various purposes in the arts. See the Note under Petrolatum. [Written also vaselin.]
VASE-SHAPED
Vase"-shaped`, a.
Defn: Formed like a vase, or like a common flowerpot.
VASIFORM
Vas"i*form, a. Etym: [L. vas a vessel + -form.] (Biol.)
Defn: Having the form of a vessel, or duct. Vasiform tissue (Bot.), tissue containing vessels, or ducts.
VASOCONSTRICTOR
Vas`o*con*strict"or, a. (Physiol.)
Defn: Causing constriction of the blood vessels; as, the vasoconstrictor nerves, stimulation of which causes constriction of the blood vessels to which they go. These nerves are also called vasohypertonic. n.
Defn: A substance which causes constriction of the blood vessels.
Such substances are used in medicine to raise blood pressure.