Source : Webster's Revised Unabridged Dictionary (1913)

Kibble \Kib"ble\, v. t.
   To bruise; to grind coarsely; as, kibbled oats. [Prov.Eng.]
   --Halliwell.

Kibble \Kib"ble\, n.
   A large iron bucket used in Cornwall and Wales for raising
   ore out of mines. [Prov. Eng.] [Written also {kibbal}.]

Source : WordNet®

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