plural of sailing ship

plural of sailing vessel

To depart on a voyage by boat.

(idiomatic, nautical) With sails unfurled; powered by the wind. / In motion.

(astronautics) a solar sail.

(idiomatic, uncountable) Used to describe an activity that is not encountering any problems.

plural of point of sail

(nautical) A technique for navigation using planar geometry. / (nautical, proscribed) A technique for navigation using the assumption the Earth is flat.

(astronautics) A solar sail.

(astronautics) A sail-like structure on a spacecraft consisting of enormous ultrathin mirrors, propulsion being achieved by the radiation pressure of light from a star or laser.