1. One who courses or hunts.
leash is a leathern thong by which . . . a courser leads his greyhound.
2. A swift or spirited horse; a racer or a war horse; a charger. [Poetic.]
3. Zool. A grallatorial bird of Europe (Cursorius cursor), remarkable for its speed in running. Sometimes, in a wider sense, applied to running birds of the Ostrich family.
n : swift-footed terrestrial plover-like bird of southern Asia