nightcrawler

from WordNet (r) 3.0 (2006)

nightcrawler
    n 1: 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}, {angleworm}, {fishworm},
         {fishing worm}, {wiggler}, {nightwalker}, {nightcrawler},
         {crawler}, {dew worm}, {red worm}]

from The Collaborative International Dictionary of English v.0.48

nightcrawler \nightcrawler\ n.
   A terrestrial worm that burrows into and helps aerate soil;
   an earthworm. It often surfaces when the ground is cool or
   wet, and is used as bait by anglers. The term is used mostly
   in the northern and western U. S.

   Syn: earthworm, angleworm, fishworm, fishing worm, wiggler,
        nightwalker, dew worm, red worm.
        [WordNet 1.5]