An Etymological Dictionary of Astronomy and Astrophysics

A surface, such as a cylinder or cone, that can be generated by moving a straight line.

Etymology (EN): Ruled, p.p. of rule; → surface.

Etymology (PE): Ruyé, → surface; xatt sâxté “built, formed by a line,” from xatt→ line; sâxté, p.p. of sâxtan “to build, make, fashion; to adapt, adjust, be fit” (from
Mid.Pers. sâxtan, sâz-, Manichean Parthian s’c’dn “to prepare, to form;” Av. sak- “to understand, to mark,” sâcaya- (causative) “to teach”).