from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A pump for compressing, removing, or forcing a flow of air.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A pump that moves air either into, or out of, something.

from the GNU version of the Collaborative International Dictionary of English

  • 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.
  • A pump used to exhaust from a condenser the condensed steam, the water used for condensing, and any commingled air.

from The Century Dictionary and Cyclopedia

  • n. An apparatus for the exhaustion, compression, or transmission of air.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a pump that moves air in or out of something


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