The Collaborative International Dictionary of English v.0.48:

Edible \Ed"i*ble\, a. [L. edibilis, fr. edere to eat. See
   Eat.]
   Fit to be eaten as food; eatable; esculent; as, edible
   fishes. --Bacon. -- n. Anything edible.
   [1913 Webster]

   Edible bird's nest. See Bird's nest, 2.

   Edible crab (Zo["o]l.), any species of crab used as food,
      esp. the American blue crab (Callinectes hastatus). See
      Crab.

   Edible frog (Zo["o]l.), the common European frog (Rana
      esculenta), used as food.

   Edible snail (Zo["o]l.), any snail used as food, esp.
      Helix pomatia and H. aspersa of Europe.
      [1913 Webster]

WordNet (r) 3.0 (2006):

edible
    adj 1: suitable for use as food [syn: edible, comestible,
           eatable] [ant: inedible, uneatable]
    n 1: any substance that can be used as food [syn: comestible,
         edible, eatable, pabulum, victual, victuals]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "edible":
   board, bread, bread and butter, cheer, comestible, comestibles,
   creature comfort, cuisine, daily bread, dainty, delicious,
   digestible, eatable, eatables, edibles, esculent, fare, fast food,
   feast, food, food and drink, foodstuff, good to eat, gustable,
   health food, ingesta, junk food, kitchen stuff, kosher, meat,
   nourishing, nutritious, nutritive, palatable, provender, provision,
   savory, spread, succulent, sustenance, table, tasty, toothsome,
   tucker, viands, victuals, vittles, wholesome



The Devil's Dictionary (1881-1906):

EDIBLE, adj.  Good to eat, and wholesome to digest, as a worm to a
toad, a toad to a snake, a snake to a pig, a pig to a man, and a man
to a worm.