nit  
noun uk/nɪt/ us/nɪt/
  (PERSON)     
  [ C ] UK informal disapproving傻瓜(同 nitwit) 
a  nitwit informal disapproving 
   (EGG)      
 [ C usually plural ]虱卵 
the egg of a louse, which sticks to the fur of an animal or the hair of a person
  A few of the children have nits. 几个孩子身上有虱子。 
 You don't get nits from having dirty hair. 只是头发脏不会长虱子。