Etymology
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kibble (n.)

"ground-up meat used as dog food, etc.," 1957, apparently from the verb meaning "to bruise or grind coarsely," which is attested from 1790, first in milling; a word of unknown origin. The same or an identical word was used in the coal trade in the late 19c. and in mining from the 1670s for "bucket used to haul up ore or waste."

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Definitions of kibble

kibble (n.)
coarsely ground grain in the form of pellets (as for pet food);
kibble (n.)
an iron bucket used for hoisting in wells or mining;
From wordnet.princeton.edu