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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Any of an ancient breed of large strong dogs, probably originating in Asia and having a short, often fawn-colored coat.

Century Dictionary and Cyclopedia

  1. n. A variety of dog of considerable antiquity. A true-bred mastiff is of large size, and very stoutly built. The head is well developed and large, the lips deep and pendulous on each side of the mouth, and the whole aspect noble. This animal is capable of great attachment, and is valuable as a watch-dog.

Wiktionary

  1. n. One of several large breeds of dog (such as bulldogs and Saint Bernards), often used as guard dogs

GNU Webster's 1913

  1. n. A breed of large dogs noted for strength and courage. There are various strains, differing in form and color, and characteristic of different countries.

WordNet 3.0

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

Etymologies

  1. Middle English mastif, alteration (perhaps influenced by Old French mestif, mongrel) of Old French mastin, from Vulgar Latin *(canis) mānsuētīnus, tame (dog), from Latin mānsuētus, past participle of mānsuēscere, to tame : manus, hand; see man-2 in Indo-European roots + suēscere, to accustom; see s(w)e- in Indo-European roots.

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‘mastiff’ has been looked up 1056 times, loved by 1 person, added to 14 lists, and has a Scrabble score of 15.