Defn: The quality or state of being vacuous; emptiness; vacuity. W.
Montagu.

VACUUM
Vac"u*um, n.; pl. E. Vacuums, L. Vacua. Etym: [L., fr. vacuus empty.
See Vacuous.]

1. (Physics)

Defn: A space entirely devoid of matter (called also, by way of distinction, absolute vacuum); hence, in a more general sense, a space, as the interior of a closed vessel, which has been exhausted to a high or the highest degree by an air pump or other artificial means; as, water boils at a reduced temperature in a vacuum.

2. The condition of rarefaction, or reduction of pressure below that of the atmosphere, in a vessel, as the condenser of a steam engine, which is nearly exhausted of air or steam, etc.; as, a vacuum of 26 inches of mercury, or 13 pounds per square inch. Vacuum brake, a kind of continuous brake operated by exhausting the air from some appliance under each car, and so causing the pressure of the atmosphere to apply the brakes. — Vacuum pan (Technol.), a kind of large closed metallic retort used in sugar making for boiling down sirup. It is so connected with an exhausting apparatus that a partial vacuum is formed within. This allows the evaporation and concentration to take place at a lower atmospheric pressure and hence also at a lower temperature, which largely obviates the danger of burning the sugar, and shortens the process. — Vacuum pump. Same as Pulsometer, 1. — Vacuum tube (Phys.), a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a Geissler tube. — Vacuum valve, a safety valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, in order to prevent collapse. — Torricellian vacuum. See under Torricellian.

VACUUM CLEANER
Vac"u*um clean"er.

Defn: A machine for cleaning carpets, tapestry, upholstered work, etc., by suction.

VADANTES Va*dan"tes, n. pl. Etym: [NL., from L. vadans, p. pr. of vadare to wade, to ford.] (Zoöl.)

Defn: An extensive artificial group of birds including the wading, swimming, and cursorial birds.

VADE
Vade, v. i. Etym: [For fade.]