Source : Webster's Revised Unabridged Dictionary (1913)

Harrier \Har"ri*er\, n. [From {Harry}.]
   1. One who harries.

   2. (Zo["o]l.) One of several species of hawks or buzzards of
      the genus {Circus} which fly low and harry small animals
      or birds, -- as the European marsh harrier ({Circus
      [ae]runginosus}), and the hen harrier ({C. cyaneus}).

   {Harrier hawk}(?), one of several species of American hawks
      of the genus {Micrastur}.