- A pirate; one who cruises about without authorization from any government, to seize booty on sea or land.
- A piratical vessel."Barbary corsairs . . . infested the coast of the Mediterranean." [Prescott.]
- [Zoöl] A Californian market fish (Sebastichthys rosaceus).
Etymology: F. corsairecf. It. corsare corsale, Pr. corsari), LL. corsarius, fr. L. cursus a running, course, whence Sp. corso cruise, corsa cruise, coasting voyage, corsear to cruise against the enemy, to pirate, corsario cruising, a privateer authorized to cruise against the enemy. See Course