• Webster's Revised Unabridged Dictionary
    • n Oxfly (Zoöl) The gadfly of cattle.
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Century Dictionary and Cyclopedia
    • n oxfly The œstrus or bot-fly, Hypoderma bovis, which infests cattle.
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In literature:

How Gargantua was sent to Paris, and of the huge great mare that he rode on; how she destroyed the oxflies of the Beauce.
"Gargantua and Pantagruel, Complete." by Francois Rabelais