Cyl″in‐droid (s?l″?n–droid), n. [Gr. κύλινδροσ cylinder + -oid: cf. F. cylindroïde.] 1. A solid body resembling a right cylinder, but having the bases or ends elliptical.
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.