plural of solar sail

plural of photon sail

(astronautics) a solar sail.

plural of light 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.

(astronautics) A solar sail.

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.

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

plural of working sail