The Collaborative International Dictionary
Nitter
Nitter \Nit"ter\, n. [From Nit.] (Zo["o]l.) The horse louse; an insect that deposits nits on horses.
Wiktionary
nitter
n. (context zoology English) A louse that deposits nits on horses.
Usage examples of "nitter".
As the helicopters turned back, as Piper nittered and wriggled and tried to pant, and as Root shook her head with misgiving, Milena began to climb the stairs that led to her home.