has particulars: biting midge, no-see-um, punkey, punkie, punky, midge, psychodid, phlebotomus papatasii, sand fly, sandfly, black fly, blackfly, buffalo gnat

gnat(n = noun.animal) - (British usage) mosquito;

is a kind of

mosquito

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CIDE DICTIONARY

gnat, n. [AS. gnæt.].

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. [1913 Webster]
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. [1913 Webster]

Gnat catcher (Zoöl.), one of several species of small American singing birds, of the genus Polioptila, allied to the kinglets. -- Gnat flower, the bee flower. -- Gnat hawk (Zoöl.), the European goatsucker; -- called also gnat owl. -- Gnat snapper (Zoöl.), a bird that catches gnats. -- Gnat strainer, a person ostentatiously punctilious about trifles. Cf. Matt. xxiii. 24.

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OXFORD DICTIONARY

gnat, n.
1 any small two-winged biting fly of the genus Culex, esp. C. pipiens.
2 an insignificant annoyance.
3 a tiny thing.

Etymology

OE gn{aelig}tt

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THESAURUS

gnat

crumb, dot, drop, droplet, fleck, flyspeck, grain, iota, jot, microbe, microorganism, midge, minim, minutia, minutiae, mite, mote, particle, pinhead, pinpoint, point, scrap, snip, snippet, speck, tittle, vanishing point

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ROGET THESAURUS

gnat

Littleness

N littleness, smallness, exiguity, inextension, parvitude, parvity, duodecimo, Elzevir edition, epitome, microcosm, rudiment, vanishing point, thinness, dwarf, pygmy, pigmy, Liliputian, chit, pigwidgeon, urchin, elf, atomy, dandiprat, doll, puppet, Tom Thumb, Hop-o'-my-thumb, manikin, mannikin, homunculus, dapperling, cock-sparrow, animalcule, monad, mite, insect, emmet, fly, midge, gnat, shrimp, minnow, worm, maggot, entozoon, bacteria, infusoria, microzoa, phytozoaria, microbe, grub, tit, tomtit, runt, mouse, small fry, millet seed, mustard seed, barleycorn, pebble, grain of sand, molehill, button, bubble, point, atom, fragment, powder, point of a pin, mathematical point, minutiae, micrometer, vernier, scale, microphotography, photomicrography, micrography, photomicrograph, microphotograph, microscopy, microscope (optical instruments), little, small, minute, diminutive, microscopic, microzoal, inconsiderable, exiguous, puny, tiny, wee, petty, minikin, miniature, pygmy, pigmy, elfin, undersized, dwarf, dwarfed, dwarfish, spare, stunted, limited, cramp, cramped, pollard, Liliputian, dapper, pocket, portative, portable, duodecimo, dumpy, squat, short, impalpable, intangible, evanescent, imperceptible, invisible, inappreciable, insignificant, inconsiderable, trivial, infinitesimal, homoeopathic, atomic, subatomic, corpuscular, molecular, rudimentary, rudimental, embryonic, vestigial, weazen, scant, scraggy, scrubby, thin, granular, shrunk, brevipennate, in a small compass, in a nutshell, on a small scale, minutely, microscopically.

Also see definition of "gnat" in Bible Study Dictionaries

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