mastiff

/ˈmæstəf/
IPA guide

Other forms: mastiffs

Definitions of mastiff
  1. noun
    an old breed of powerful deep-chested smooth-coated dog used chiefly as a watchdog and guard dog
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    types:
    Tibetan mastiff
    very large powerful rough-coated dog native to central Asia
    type of:
    working dog
    any of several breeds of usually large powerful dogs bred to work as draft animals and guard and guide dogs
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