What is "cursorius cursor"

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.