Source : Webster's Revised Unabridged Dictionary (1913)

Earthworm \Earth"worm`\, n.
   1. (Zo["o]l.) Any worm of the genus {Lumbricus} and allied
      genera, found in damp soil. One of the largest and most
      abundant species in Europe and America is {L. terrestris};
      many others are known; -- called also {angleworm} and
      {dewworm}.

   2. A mean, sordid person; a niggard. --Norris.

Source : WordNet®

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