An Etymological Dictionary of the German Language/Niß
Niß, f., ‘nit,’ from the equiv. MidHG. niȥ (ȥȥ), f., for hniȥ; corresponding to Du. neet, AS. hnitu, f., and the equiv. E. nit; Goth. *hnits is not recorded. According to the permutation of consonants Gr. κονίς, plur. κονίδες, ‘eggs of lice, bugs, fleas,’ &c., may be akin, if the words in both languages be based on knid. It has also been connected with Slav. gnida. Nuß is not allied.