2) In lighting, the nit is a unit of visible-light intensity, commonly used to specify the brightness of a cathode ray tube or liquid crystal display computer display. Top Definition. nit. gambling term. usually found in poolrooms. Refers to: 1. Someone who's so afraid to lose a bet that they have to be coddled and convinced for. Definition of nit - the egg or young form of a louse or other parasitic insect, especially the egg of a human head louse attached to a hair., a foolis.
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Worst head lice infestation ever: Adult shows child how to get rid of head lice with a nit comb
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