WordNet (r) 3.0 (2006):

red worm
    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]