An Etymological Dictionary of Astronomy and Astrophysics

A surface produced by the revolution of a conic section (such as a circle) around a line lying in its plane, but not cutting the conic. The solid enclosed by such a surface.

Etymology (EN): From L. torus “a round, swelling protuberance.”

Etymology (PE): Cambar “torus,” originally “hoop, circle,” from Mid.Pers. cambar “hoop; a ring-shaped headdress,” cambar vâcik “playing tambourine.”