From Longman Dictionary of Contemporary Englishnitnit /nɪt/ noun [countable] 1 HBIDCBan egg of a louse (=a small insect that sucks blood), that is sometimes found in people’s hair2 British English informalSTUPID/NOT INTELLIGENT a silly person
Examples from the Corpus
nit• His nanny had a cure for nits.• She had to work in that awful place and get nits and steal and be beaten for wetting the bed.• You can't mistake nits for dandruff.• A litany of nits, ringworm, fleas and unmentionables ... But as the weeks and months passed, everything changed.• I look a right nit in that uniform.• Careful examination will reveal the tell-tale nits attached to the hairs.• The nits are shiny and firmly attached to the hair.• Nobody wanted to share a desk with the only girl in the class with nits in her head.Origin nit Old English hnitu 