harrier1
  
  n.
 a person who harries others.
 
 
  
    
harrier2
  
  n.
 a hound of a breed used for hunting hares.
 
  Etymology
  ME hayrer, from hare + -er1.
 
  
    
harrier3
  
  n.
 a long-winged, slender-bodied bird of prey with low quartering flight. 
[Genus 
Circus: several species.]
 
  Etymology
  C16 (as harrower): from harrow ‘harry, rob’ (var. of harry); spelling influenced by harrier1.