Definition of mastiff bat in US English:

mastiff bat

noun

  • A heavily built free-tailed bat with a broad muzzle, found mainly in America and Australasia.

    Eumops, Molossus, and other genera, family Molossidae: several species, including the large western mastiff bat (E. perotis)

    • ‘The zoologist and his collaborator use the handheld bat detector to catalog the calls of bats such as this mastiff bat.’
    • ‘This one's a mastiff bat,’ says a zoologist with the Wildlife Conservation Society.’