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2 definitions found
 for Air pump
From The Collaborative International Dictionary of English v.0.48 :

  Air pump \Air" pump`\
     1. (Physics) A kind of pump for exhausting air from a vessel
        or closed space; also, a pump to condense air or force it
        into a closed space.
        [1913 Webster]
     2. (Steam Engines) A pump used to exhaust from a condenser
        the condensed steam, the water used for condensing, and
        any commingled air.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  air pump
      n 1: a pump that moves air in or out of something [syn: air
           pump, vacuum pump]

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