1. In a ship, the principal sails, as the main sail, fore sail, and mizen; sometimes the name is given to the stay sails on the lower masts; also to the main stay sails of all brigs and schooners.

2. Catamenia; menstrual flux.

, v.i. To run; to move with speed; to run or move about; as, the blood courses.

The grayhounds coursed through the fields.