A nitpicker.
A candela per square metre.
A head louse regardless of its age.
The egg of a louse.
A young louse.
A fool, a nitwit.
Synonym of nat (“logarithmic unit of information”)
A player with an overly cautious and reactive playing style.
A minor shortcoming.
To have the modus vivendi of a drug addict, to live the life of a nitty.