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: any of a breed of very large massive powerful smooth-coated dogs that are apricot, fawn, or brindle and are often used as guard dogs
Examples of mastiff in a Sentence
Recent Examples on the Web
Hearts Melt Over Girl's Bond With Puppy By Melissa Fleur Afshar
Life and Trends Reporter
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The heartwarming bond between a Pennsylvania girl and her 200-pound English mastiff has melted the hearts of viewers online.
—Dan Perry, Newsweek, 2 Jan. 2025
Retriever Gives Birth to Rare Litter of Puppies Containing Each Color of Lab
While the Guinness Book of World Records lists the largest dog litter as a 24-pup litter born to a Neapolitan mastiff named Tia in 2004, Swartz believes Roxy's litter might be the largest for a Labrador retriever.
—Kelli Bender, People.com, 11 Dec. 2024
Collies are more exposed to overbite than other pups, while boxers, Great Danes, mastiffs, and bulldogs are at risk of developing gingival hyperplasia, which is an overgrowth or thickening of the gums.
—Matt Robison, Newsweek, 20 Nov. 2024
Other dogs listed by the American Kennel Club as the best guardians include the Rottweiler, most shepherd dogs, the Staffordshire bull terrier, volpino Italiano, and Tibetan mastiff among others.
—Marco Rubio, Newsweek, 1 Nov. 2024
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Word History
Etymology
Middle English mastif, from Medieval Latin mastivus, from Vulgar Latin *masuetivus, from Latin mansuetus tame — more at mansuetude
First Known Use
14th century, in the meaning defined above
Time Traveler
The first known use of mastiff was
in the 14th century
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Cite this Entry
“Mastiff.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mastiff. Accessed 18 Jan. 2025.
Kids Definition
mastiff
noun
mas·tiff
ˈmas-təf
: any of a breed of large powerful smooth-coated dogs often used as watchdogs and guard dogs
More from Merriam-Webster on mastiff
Nglish: Translation of mastiff for Spanish Speakers
Britannica.com: Encyclopedia article about mastiff
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