The Collaborative International Dictionary of English v.0.48:

Eatable \Eat"a*ble\ ([=e]t"[.a]*b'l), a.
   Capable of being eaten; fit to be eaten; proper for food;
   esculent; edible. -- n. Something fit to be eaten.
   [1913 Webster]

WordNet (r) 3.0 (2006):

eatable
    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]