Source : Webster's Revised Unabridged Dictionary (1913)

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.