La Salle[lə sal′; Fr lȧ sȧl′]
La Salle, Sieur Robert Cavelier de 1643-87; Fr. explorer in North America
, Sieur de. Title of Robert Cavelier. 1643–1687.
French explorer in North America who, having descended the Mississippi River to its mouth, named the entire drainage basin “Louisiana,” claiming it for France (1682).