[1] : The Collaborative International Dictionary of English v.0.48

vacuum \vac"uum\ va^k"-uu^m, n.; pl. e. vacuums
   va^k"-uu^mz, l. vacua va^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
see also:
vacuums vacua vacuous vacuum brake vacuum pan vacuum pump 
pulsometer vacuum tube vacuum valve torricellian vacuum torricellian 

[2] : WordNet (r) 2.0

vacuum tube
     n : electronic device consisting of a system of electrodes
         arranged in an evacuated glass or metal envelope syn: tube,
          thermionic vacuum tube, thermionic tube, electron
         tube, thermionic valve
see also:
tube thermionic vacuum tube thermionic tube electron tube thermionic valve 

[3] : The Free On-line Dictionary of Computing (27 SEP 03)

vacuum tube
     
        electron tube
     
     
see also:
electron tube 

Tube >> T Words
Tube, definition of term: Tube
tube_pag1.html

Tube Foot >> T Words
Tube Foot, definition of term: Tube Foot
tube+foot_pag1.html

Pneumatic Tube >> P Words
Pneumatic Tube, definition of term: Pneumatic Tube
pneumatic+tube_pag1.html

Pollen Tube >> P Words
Pollen Tube, definition of term: Pollen Tube
pollen+tube_pag1.html

Thermionic Tube >> T Words
Thermionic Tube, definition of term: Thermionic Tube
thermionic+tube_pag1.html

Pitot Tube >> P Words
Pitot Tube, definition of term: Pitot Tube
pitot+tube_pag1.html

Test Tube >> T Words
Test Tube, definition of term: Test Tube
test+tube_pag1.html

Picture Tube >> P Words
Picture Tube, definition of term: Picture Tube
picture+tube_pag1.html

Capillary Tube >> C Words
Capillary Tube, definition of term: Capillary Tube
capillary+tube_pag1.html

Bronchial Tube >> B Words
Bronchial Tube, definition of term: Bronchial Tube
bronchial+tube_pag1.html

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