mite1
  
  n.
 a minute arachnid with four pairs of legs, several kinds of which are parasitic. 
[Order Acari: many species.]
 
  Etymology
  OE mīte, of Gmc origin.
 
  
    
mite2
  
  n.
  - a small child or animal.
 - a very small amount. 
▸historical a small coin, in particular a small Flemish copper coin of very low face value.
 
adv.
 
(
a mite)
 
informal a little; slightly.
 
  Etymology
  ME (denoting a small Flemish copper coin): from MDu. mīte; prob. from the same Gmc word as mite1.