Nit (?), n. [AS. hnitu; akin to D. neet, G. niss, OHG. niz; cf. gr. , , Icel. gnit, Sw. gnet, Dan. gnid, Russ. & Pol. gnida, Bohem. hnida, W. nedd.] (Zo'94l.) The egg of a louse or other small insect.Nit grass (Bot.), a pretty annual European grass (Gastridium lendigerum), with small spikelets somewhat resembling a nit. It is also found in California and Chili.
The noun Nit has 2 senses
1. nit -- egg or young of an insect parasitic on mammals especially a sucking louse; often attached to a hair or item of clothing
2. nit -- a luminance unit equal to, candle per square meter measured perpendicular to the rays from the source