: a small, lively terrier of either of two breeds that was formerly used to dig out foxes, that weighs about 16 to 18 pounds (7.3 to 8.2 kilograms), and that has a flat moderately narrow skull, a long muzzle, small V-shaped ears which droop forward, straight forelegs, and muscular hindquarters:
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Merriam-Webster unabridged
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