1. (Science: zoology) One of a small breed of hounds, used for hunting hares.
2. (Science: ornithology) 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 aerunginosus), and the hen harrier (Circus cyaneus). Harrier hawk, one of several species of American hawks of the genus Micrastur.
alternative forms: harier.
Origin: From hare.