Source : Webster's Revised Unabridged Dictionary (1913)

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}.

   2. The desire for food caused by hunger; appetite; as, a good
      stomach for roast beef. --Shak.

   3. Hence appetite in general; inclination; desire.

            He which hath no stomach to this fight, Let him
            depart.                               --Shak.

   4. Violence of temper; anger; sullenness; resentment; willful
      obstinacy; stubbornness. [Obs.]

            Stern was his look, and full of stomach vain.
                                                  --Spenser.

            This sort of crying proceeding from pride,
            obstinacy, and stomach, the will, where the fault
            lies, must be bent.                   --Locke.

   5. Pride; haughtiness; arrogance. [Obs.]

            He was a man Of an unbounded stomach. --Shak.

   {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} (Zo["o]l.), the common roundworm ({Ascaris
      lumbricoides}) found in the human intestine, and rarely in
      the stomach.

Ascarid \As"ca*rid\, n.; pl. {Ascarides}or {Ascarids}. [NL.
   ascaris, fr. Gr. ?.] (Zo["o]l.)
   A parasitic nematoid worm, espec. the roundworm, {Ascaris
   lumbricoides}, often occurring in the human intestine, and
   allied species found in domestic animals; also commonly
   applied to the pinworm ({Oxyuris}), often troublesome to
   children and aged persons.

Mawworm \Maw"worm`\, n. [Maw the belly + worm.] (Zo["o]l.)
   (a) Any intestinal worm found in the stomach, esp. the common
       round worm ({Ascaris lumbricoides}), and allied species.
   (b) One of the larv[ae] of botflies of horses; a bot.

Source : WordNet®

Ascaris lumbricoides
     n : intestinal parasite of humans and pigs [syn: {common
         roundworm}]