The Collaborative International Dictionary of English v.0.48:

Maggot \Mag"got\, n. [W. macai, pl. maceiod, magiod, a worn or
   grub; cf. magu to bread.]
   1. (Zool.) The footless larva of any fly. See Larval.
      [1913 Webster]

   2. A whim; an odd fancy. --Hudibras. Tennyson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

maggot
    n 1: the larva of the housefly and blowfly commonly found in
         decaying organic matter

Moby Thesaurus II by Grady Ward, 1.0:

103 Moby Thesaurus words for "maggot":
   alabaster, apparition, arachnid, arthropod, aurelia, bee, beetle,
   boutade, brainchild, brainstorm, bubble, bug, capriccio, caprice,
   caterpillar, centipede, chalk, chilopod, chimera, chrysalis,
   cocoon, conceit, crank, craze, crazy idea, crotchet,
   daddy longlegs, delirium, diplopod, driven snow, eidolon, fad,
   fancy, fantasque, fantastic notion, fantasy, fiction, figment,
   fleece, flimflam, flour, fly, foam, fool notion, freak,
   freakish inspiration, grub, hallucination, harebrained idea,
   harvestman, hexapod, humor, idle fancy, illusion, imagery,
   imagination, imagining, insect, insubstantial image, invention,
   ivory, kink, larva, lily, make-believe, megrim, milk, millepede,
   millipede, mite, myth, notion, nymph, nympha, paper, passing fancy,
   pearl, phantasm, phantom, pupa, quirk, romance, scorpion, sheet,
   sick fancy, silver, snow, spider, swan, tarantula,
   thick-coming fancies, tick, toy, trip, vagary, vapor, vision, whim,
   whim-wham, whimsy, wiggler, wildest dreams, wriggler