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bullmastiff

or bull-mas·tiff, bull mas·tiff

[boo l-mas-tif, -mah-stif]
noun
  1. one of an English breed of dogs having a short, fawn or brindled coat, produced by crossing the bulldog and the mastiff.
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Origin of bullmastiff

First recorded in 1870–75; bull(dog) + mastiff
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018