Courser \Cours"er\ (k?rs"?r), n. [F. coursier.]

1. One who courses or hunts.

leash is a leathern thong by which . . . a courser leads his greyhound. --Hanmer.

2. A swift or spirited horse; a racer or a war horse; a charger. [Poetic.]

--Pope.

3. (Zo["o]l.) 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.

Source: Webster's Revised Unabridged Dictionary (1913)