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n. - An old breed of powerful deep-chested smooth-coated dog used chiefly as a watchdog and guard dog.

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Usage examples (30)
  • At the call the mastiff came up and looked inquiringly at his master.
  • The mastiff is a large, grave, sullen-looking dog, with a wide chest, noble head, long switch tail, bright eyes, and a loud, deep voice.
  • There was no hope for the mastiff from the first.
  • It is not pleasant to be mauled by a huge mastiff.
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The Open Dictionary of English is a collaborative project, based on Open Source materials, LearnThat resources, and partner APIs.
We give special thanks to our LearnThat volunteers, as well as Princeton University and Wiktionary for their Open Source word data. We're also grateful for the support given by Google, Wordnik.com, Dictionary.com, Stands4.com and YouTube, OEDILF.com, Kylescholz.com, Best-Practice.com, Forvo.com, as well as the generous Creative Commons community.