4 definitions found From The Collaborative International Dictionary of English v.0.48 [gcide]: Vacuum \Vac"u*um\ (v[a^]k"[-u]*[u^]m), n.; pl. E. {Vacuums} (v[a^]k"[-u]*[u^]mz), L. {Vacua} (v[a^]k"[-u]*[.a]). [L., fr. vacuus empty. See {Vacuous}.] 1. (Physics) 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. [1913 Webster] [1913 Webster] 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. [1913 Webster] {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) a glass tube provided with platinum electrodes and exhausted, for the passage of the electrical discharge; a Geissler tube. (a) any tube used in electronic devices, containing a vacuum and used to control the flow of electrons in a circuit, as a vacuum diode, triode, tetrode, or pentode. {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}. [1913 Webster] From The Collaborative International Dictionary of English v.0.48 [gcide]: Vacuum cleaner \Vac"u*um clean"er\ A machine for cleaning carpets, tapestry, upholstered work, etc., by suction; -- sometimes called a {vacuum}. [Webster 1913 Suppl.] From WordNet (r) 2.0 [wn]: vacuum n 1: the absence of matter [syn: {vacuity}] 2: an empty area or space; "the huge desert voids"; "the emptiness of outer space"; "without their support he'll be ruling in a vacuum" [syn: {void}, {vacancy}, {emptiness}] 3: a region empty of matter [syn: {vacuity}] 4: an electrical home appliance that cleans by suction [syn: {vacuum cleaner}] v : clean with a vacuum cleaner; "vacuum the carpets" [syn: {vacuum-clean}, {hoover}] [also: {vacua} (pl)] From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]: 43 Moby Thesaurus words for "vacuum": absence, absence of mind, blank, blankness, broom, brush, brush off, clean slate, deprivation, emptiness, empty space, empty-headedness, hollowness, inanity, jejunity, mental void, negation, negativeness, negativity, nihility, nonbeing, nonentity, nonexistence, nonoccurrence, nonreality, nonsubsistence, not-being, nothing, nothingness, nullity, sweep, sweep out, sweep up, tabula rasa, unactuality, unreality, vacancy, vacuity, vacuousness, vacuum-clean, vapidity, void, whisk
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