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]

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.