Other forms: horseflies
A horsefly is a large fly whose bite draws blood. Bitten by a horsefly, swat the horsefly, horseflies near the water.
Only the female bites, and she cuts the skin rather than piercing it, which is why the bite hurts at the time and swells afterwards. They hunt by sight near water and livestock on still warm days.
1nounhorseflyA large fly whose bite draws blood.
“A horsefly bit me on the leg while we were walking by the river.”
horsefly is an insect.
Horse plus fly, recorded in Middle English, from the flies that torment horses.
Middle English
horse fliȝe
English, today
horsefly
From Middle English horse fliȝe, equivalent to horse + fly.
Etymology from Wiktionary, CC BY-SA