Stories We Like: A Guide to the Comma
Old English hnitu "louse egg, nit," from Proto-Germanic *khnito (cf. Norwegian nit, Middle Dutch nete, Dutch neet, Middle High German niz, German Niß), from PIE root *knid- "egg of a louse" (cf. Russian, Polish gnida, Czech knida; Greek konidos, genitive konis "egg of a louse").
The egg or young of a parasitic insect, such as a louse.
Nothing; zilch: If you're wondering about their homosexual records, it's nit
[fr Yiddish or perhaps German dialect]