The Collaborative International Dictionary of English v.0.48:

Stomach \Stom"ach\, n. [OE. stomak, F. estomac, L. stomachus,
   fr. Gr. sto`machos stomach, throat, gullet, fr. sto`ma a
   mouth, any outlet or entrance.]
   1. (Anat.) An enlargement, or series of enlargements, in the
      anterior part of the alimentary canal, in which food is
      digested; any cavity in which digestion takes place in an
      animal; a digestive cavity. See Digestion, and Gastric
      juice, under Gastric.
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   2. The desire for food caused by hunger; appetite; as, a good
      stomach for roast beef. --Shak.
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   3. Hence appetite in general; inclination; desire.
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            He which hath no stomach to this fight,
            Let him depart.                       --Shak.
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   4. Violence of temper; anger; sullenness; resentment; willful
      obstinacy; stubbornness. [Obs.]
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            Stern was his look, and full of stomach vain.
                                                  --Spenser.
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            This sort of crying proceeding from pride,
            obstinacy, and stomach, the will, where the fault
            lies, must be bent.                   --Locke.
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   5. Pride; haughtiness; arrogance. [Obs.]
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            He was a man
            Of an unbounded stomach.              --Shak.
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   Stomach pump (Med.), a small pump or syringe with a
      flexible tube, for drawing liquids from the stomach, or
      for injecting them into it.

   Stomach tube (Med.), a long flexible tube for introduction
      into the stomach.

   Stomach worm (Zool.), the common roundworm (Ascaris
      lumbricoides) found in the human intestine, and rarely in
      the stomach.
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WordNet (r) 3.0 (2006):

stomach pump
    n 1: a suction pump used to remove the contents of the stomach