Wordnet 3.0
NOUN (2)
1. 
 coarsely ground grain in the form of pellets (as for pet food); 
2. 
 an iron bucket used for hoisting in wells or mining; 
The Collaborative International Dictionary of English v.0.48:
Kibble \Kib"ble\, v. t.
   To bruise; to grind coarsely; as, kibbled oats. [Prov.Eng.]
   --Halliwell.
   [1913 Webster]
The Collaborative International Dictionary of English v.0.48:
Kibble \Kib"ble\, n.
   A large iron bucket used in Cornwall and Wales for raising
   ore out of mines. [Prov. Eng.] [Written also kibbal.]
   [1913 Webster]
WordNet (r) 3.0 (2006):
kibble
    n 1: coarsely ground grain in the form of pellets (as for pet
         food)
    2: an iron bucket used for hoisting in wells or mining