Meaning

noun a luminance unit equal to 1 candle per square meter measured perpendicular to the rays from the source

noun egg or young of an insect parasitic on mammals especially a sucking louse; often attached to a hair or item of clothing

originFrom Middle English nite, from Old English hnitu, from Proto-Germanic *hnits (compare Dutch neet, German Nisse, Norwegian nit), from Proto-Indo-European *-níd- (compare Scottish Gaelic sneadh, Lithuanian gli̇̀nda, Polish gnida, Albanian thëri, Ancient Greek κονίς (konís)).

Etymology from Wiktionary, CC BY-SA 3.0