• WordNet 3.6
    • n horsefly large swift fly the female of which sucks blood of various animals
    • n horsefly winged fly parasitic on horses
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Webster's Revised Unabridged Dictionary
  • Interesting fact: Male horseflies can fly over 90mph.
    • Horsefly (Zoöl) Any dipterous fly of the family Tabanidæ, that stings horses, and sucks their blood.
    • Horsefly (Zoöl) The horse tick or forest fly (Hippobosca).
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Century Dictionary and Cyclopedia
    • n horsefly A hexachætous dipterous insect, as Tabanus bovinus and other species of the family Tabanidæ, of which the females have a piercing proboscis, and are extremely annoying to horses and cattle. Also called breeze, breeze-fly, and gadfly. See cuts under breeze and gadfly.
    • n horsefly A pupiparous dipterous insect of the family Hippoboscidæ; a forest-fly or tick-fly. Also called horse-tick.
    • n horsefly A dichætous dipterous insect of the family Œstridæ; a true bot-fly, as the horse-bot, Gasterophilus equi. See cut under bot-fly.
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In literature:

The common horsefly, which is so troublesome in the shady lanes of England, belongs to this same genus.
"A Naturalist's Voyage Round the World" by Charles Darwin
Another was intended to propitiate the horsefly.
"The Foundations of Japan" by J.W. Robertson Scott
While spiders most commonly mimic ants, we hear also of their imitating beetles, snail-shells, ichneumons and horseflies.
"A Book of Natural History" by Various
He is about the size of the green-headed horsefly, but of more athletic build.
"The Tent Dwellers" by Albert Bigelow Paine
There was a flash of light and a whistle past his ear, the sound of a hurried horsefly.
"Caribbee" by Thomas Hoover
The grassy path was as slippery as glass, the rocks radiated heat, the bracken radiated horseflies.
"Some Experiences of an Irish R.M." by E. OE. Somerville
Notwithstanding heat and horseflies, the time passed not disagreeably, and I was, at all events, out of range of the piano.
"Further Experiences of an Irish R.M." by E. OEnone Somerville
Horseflies are unusually abundant in the neighborhood of ponds and streams.
"Great Hike" by Alan Douglas
It is strange how very scarce snakes of every description are, as well as insects, except mosquitoes and horseflies.
"Audubon and his Journals, Vol. 2" by Maria R. Audubon
Horsefly, Green Headed, 167.
"Book of Monsters" by David Fairchild and Marian Hubbard (Bell) Fairchild

In news:

The beer's the thing at Horsefly Brewing Company, although the food, especially the burgers and the wings, elevate the menu beyond your usual bar-food fare.
To scientists' surprise, pattern optimally scrambles horsefly vision.