CYLINDROID

Cyl″in‐droid (s?l″?n–droid), n. [[Gr. κύλινδροσ cylinder + -oid: cf. F. cylindroïde.]] 1. 1. A solid body resembling a right cylinder, but having the bases or ends elliptical.
2. 2. (Geom.) A certain surface of the third degree, described by a moving straight line; — used to illustrate the motions of a rigid body and also the forces acting on the body.