
Horse-fly is the most widely used English common name for members of the family Tabanidae. Apart from the common name `horse-flies`, broad categories of biting, bloodsucking Tabanidae are variously known as breeze flies, cleggs, klegs, or clags, deer flies, gadflies, or zimbs. In some areas of Canada, they also are known as bull dog flies, and i.....
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http://en.wikipedia.org/wiki/Horse-fly

any member of the insect family Tabanidae (order Diptera), but more specifically any member of the genus Tabanus. These stout flies, as small as a ... [1 related articles]
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http://www.britannica.com/eb/a-z/h/71

The Horse-fly (Hippobosca) is a winged insect of the family Hippoboscidae which is parasitic on the horse.
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http://www.probertencyclopaedia.com/browse/BH.HTM

any bloodsucking, usually large fly of the family Tabanidae, esp. of the genus Tabanus, a serious pest of horses, cattle, etc.
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https://www.infoplease.com/dictionary/horse-fly
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