Source : Webster's Revised Unabridged Dictionary (1913)

Angleworm \An"gle*worm`\, n. (Zo["o]l.)
   A earthworm of the genus {Lumbricus}, frequently used by
   anglers for bait. See {Earthworm}.

Source : WordNet®

angleworm
     n : terrestrial worm that burrows into and helps aerate soil;
         often surfaces when the ground is cool or wet; used as
         bait by anglers [syn: {earthworm}, {fishworm}, {fishing
         worm}, {wiggler}, {nightwalker}, {nightcrawler}, {crawler},
          {dew worm}, {red worm}]