GNU Collaborative International Dictionary of English

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  1.       

    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

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