Source : Webster's Revised Unabridged Dictionary (1913)

Muckworm \Muck"worm`\, n.
   1. (Zo["o]l.) A larva or grub that lives in muck or manure;
      -- applied to the larv[ae] of the tumbledung and allied
      beetles.

   2. One who scrapes together money by mean labor and devices;
      a miser. ``Misers are muckworms.'' --Pope.