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Definition of gnat : 1. A blood- sucking dipterous fly, of the genus Culex, undergoing a metamorphosis in water. The females have a proboscis armed with needlelike organs for penetrating the skin of animals. These are wanting in the males. In America they are generally called mosquitoes. See Mosquito.
2. Any fly resembling a Culex in form or habits; esp., in America, a small biting fly of the genus Simulium and allies, as the buffalo gnat, the black fly, etc.

Synonyms:

beetle, bloodsucker

insect (part of speech: noun)

dung beetle, daddy longlegs, roach, may fly, bookworm, deer fly, ladybug, firefly, cockroach, dragonfly, bedbug, praying mantis, fruit fly, tiger moth, spider, silverfish, mosquito, katydid, gadfly, ant, louse, cicada, scorpion, termite, bee, midge, black widow, horney, tick, nit, chinch, mite, millipede, cricket, flea, stinkbug, centipede, June bug, horntail, tarantula, tsetse fly, aphid, blowfly, scarab, fly, butterfly, wasp, housefly, horsefly, botfly, chigger, moth, mantis, boll weevil, locust, yellow jacket, grasshopper, earwig, bluebottle

Usage examples: