Horsefly is a type of insect belonging to the family Tabanidae. It is also known as CLEG, GADFLY, and DEER fly. CLEG is a four-letter word for horsefly, while GADFLY and DEER fly are six-letter words for the same insect. Horseflies are large, hairy, and usually dark in color. They are known for their painful bites and loud buzzing sound. They are found in many parts of the world and are considered a nuisance to humans and animals alike.