practice, Mr. A. J. Ellis (1874) says: "Vase has four pronunciations in English: v&addz, which I most
commonly say, is going out of use, väz I hear most frequently, vaz very rarely, and vas I only know
from Cull's marking. On the analogy of case, however, it should be the regular sound."
3. (Bot.) The calyx of a plant.
(Vas"e*line) n. [Said by the manufacturer to be derived from G. wasser water + Gr. 'e`laion
olive oil.] 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`) a. Formed like a vase, or like a common flowerpot.
Vasiform tissue (Bot.), tissue containing vessels, or ducts.
(Vas"i*form) a. [L. vas a vessel + -form.] (Biol.) Having the form of a vessel, or duct.
(Vas`o*con*strict"or) a. (Physiol.) 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.
(Vas`o*den"tine) n. [L. vas a vessel + E. dentine.] (Anat.) A modified form of dentine,
which is permeated by blood capillaries; vascular dentine.
(Vas`o*di*lat"or) a.[L. vas a vessel + dilator.] (Physiol.) Causing dilation or relaxation of
the blood vessels; as, the vasodilator nerves, stimulation of which causes dilation of the blood vessels
to which they go. These nerves are also called vaso-inhibitory, and vasohypotonic nerves, since their
stimulation causes relaxation and rest.
(Vas`o*form"a*tive) a. [L. vas a vessel + formative] (Physiol.) Concerned in the development
and formation of blood vessels and blood corpuscles; as, the vasoformative cells.
(Vas`o-in*hib"i*to*ry) a. (Physiol.) See Vasodilator.
Vasomotor center, the chief dominating or general center which supplies all the unstriped muscles
of the arterial system with motor nerves, situated in a part of the medulla oblongata; a center of reflex
action by the working of which afferent impulses are changed into efferent, vasomotor impulses leading
either to dilation or constriction of the blood vessels.
(Vas`o*mo"tor) a. [L. vas a vessel + motor that which moves fr. movere to move.] (Physiol.)
Causing movement in the walls of vessels; as, the vasomotor mechanisms; the vasomotor nerves,
a system of nerves distributed over the muscular coats of the blood vessels.
(Vas"sal) n. [F., fr. LL. vassallus, vassus; of Celtic origin; cf. W. & Corn. gwas a youth, page,
servant, Arm. gwaz a man, a male. Cf. Valet, Varlet, Vavasor.]
1. (Feud. Law) The grantee of a fief, feud, or fee; one who holds land of superior, and who vows fidelity
and homage to him; a feudatory; a feudal tenant. Burrill.
2. A subject; a dependent; a servant; a slave. "The vassals of his anger." Milton.
Rear vassal, the vassal of a vassal; an arriere vassal.