From The Collaborative International Dictionary of English v.0.44 [gcide]:
Nit \Nit\ (n[i^]t), noun [AS. hnitu; akin to D. neet, G. niss, OHG. niz; cf. Gr. koni's, koni'dos, Icel. gnit, Sw. gnet, Dan. gnid, Russ. & Pol. gnida, Bohem. hnida, W. nedd.] (Zo["o]l.) The egg of a louse or other small insect.
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
61 Moby Thesaurus words for "nit": adverse criticism, animadversion, aspersion, bad notices, bad press, captiousness, carping, cat flea, cavil, caviling, censoriousness, chigoe, cockroach, crab, criticism, dog flea, exception, faultfinding, flak, flea, grayback, hairsplitting, hit, home thrust, hostile criticism, hypercriticalness, hypercriticism, imputation, jigger, knock, louse, mite, nagging, nay, niggle, niggling, nit-picking, nix, no, nope, obloquy, overcriticalness, parasite, pestering, pettifogging, priggishness, quibble, quibbling, rap, red bug, reflection, reproachfulness, roach, sand flea, slam, stricture, swipe, taking exception, trichoschistism, vermin, weevil
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