bullmastiff

or bull-mas·tiff, bull mas·tiff

[ boo l-mas-tif, -mah-stif ]
/ ˈbʊlˈmæs tɪf, -ˈmɑ stɪf /

noun

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. 2020

British Dictionary definitions for bull mastiff

bull mastiff

noun

a large powerful breed of dog with a short usually fawn or brindle coat, developed by crossing the bulldog with the mastiff
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012