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

gas \gas\ ga^s, n.; pl. gases ga^s"e^z. invented by
   the chemist van helmont of brussels, who died in 1644.
   1. an a"eriform fluid; -- a term used at first by chemists
      as synonymous with air, but since restricted to fluids
      supposed to be permanently elastic, as oxygen, hydrogen,
      etc., in distinction from vapors, as steam, which become
      liquid on a reduction of temperature. in present usage,
      since all of the supposed permanent gases have been
      liquified by cold and pressure, the term has resumed
      nearly its original signification, and is applied to any
      substance in the elastic or a"eriform state.
      1913 webster

   2. popular usage
      a a complex mixture of gases, of which the most
          important constituents are marsh gas, olefiant gas,
          and hydrogen, artificially produced by the destructive
          distillation of gas coal, or sometimes of peat, wood,
          oil, resin, etc. it gives a brilliant light when
          burned, and is the common gas used for illuminating
          purposes.
      b laughing gas.
      c any irrespirable a"eriform fluid.
          1913 webster

   3. same as gasoline; -- a shortened form. also, the
      accelerator pedal of a motor vehicle; used in the term "
      step on the gas".
      pjc

   4. the accelerator pedal of a motor vehicle; used in the term
      " step on the gas".
      pjc

   5. same as natural gas.
      pjc

   6. an exceptionally enjoyable event; a good time; as, the
      concert was a gas. slang
      pjc

   note: gas is often used adjectively or in combination; as,
         gas fitter or gasfitter; gas meter or gas-meter, etc.
         1913 webster

   air gas chem., a kind of gas made by forcing air through
      some volatile hydrocarbon, as the lighter petroleums. the
      air is so saturated with combustible vapor as to be a
      convenient illuminating and heating agent.

   gas battery elec., a form of voltaic battery, in which
      gases, especially hydrogen and oxygen, are the active
      agents.

   gas carbon, gas coke, etc. see under carbon, coke,
      etc.

   gas coal, a bituminous or hydrogenous coal yielding a high
      percentage of volatile matters, and therefore available
      for the manufacture of illuminating gas. --r. w. raymond.

   gas engine, an engine in which the motion of the piston is
      produced by the combustion or sudden production or
      expansion of gas; -- especially, an engine in which an
      explosive mixture of gas and air is forced into the
      working cylinder and ignited there by a gas flame or an
      electric spark.
      1913 webster
see also:
gases gasoline natural gas air gas gas battery gas carbon 
gas coke carbon coke gas coal gas engine 

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

air gas \air" gas`\
   see under gas.
   1913 webster airgun
see also:
gas 

[3] : WordNet (r) 2.0

air gas
     n : a gas made of carbon monoxide and hydrogen and nitrogen;
         made by passing air over hot coke syn: producer gas
see also:
producer gas 

Air >> A Words
Air, definition of term: Air
air_pag1.html

Air Pocket >> A Words
Air Pocket, definition of term: Air Pocket
air+pocket_pag1.html

Air Plant >> A Words
Air Plant, definition of term: Air Plant
air+plant_pag1.html

Air Out >> A Words
Air Out, definition of term: Air Out
air+out_pag1.html

Air Pollution >> A Words
Air Pollution, definition of term: Air Pollution
air+pollution_pag1.html

Air Pressure >> A Words
Air Pressure, definition of term: Air Pressure
air+pressure_pag1.html

Air Travel >> A Words
Air Travel, definition of term: Air Travel
air+travel_pag1.html

Air Raid >> A Words
Air Raid, definition of term: Air Raid
air+raid_pag1.html

Air Pump >> A Words
Air Pump, definition of term: Air Pump
air+pump_pag1.html

Air Mile >> A Words
Air Mile, definition of term: Air Mile
air+mile_pag1.html

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