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n. A cylindrical surface or solid, all of whose sections perpendicular to the elements are elliptical.

adj. Resembling a cylinder.

n. A cylinder with elliptical cross-section.

n. A certain three-dimensional surface described by a moving straight line, used to illustrate the motions of a rigid body and the forces that act upon it.

n. A solid body resembling a right cylinder, but having the bases or ends elliptical.

n. 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.

n. A solid body bounded by a cylindrical surface cut orthogonally by elliptical bases.

n. A conoidal cubic surface whose equation is z(x + y)—2 axy = 0.

Having the form of a cylinder with equal and parallel elliptical bases.

n. In anthropology, a cranium the norma vertical is of which is elongated, flattened at the forehead and occiput, and rounded at the sides.

n. In pathology, a body resembling a tube-cast, consisting usually only of mucus.

"It appeared to be of fixed shape, a cylindroid almost ten kilometers in length and two in diameter, majestically rotating on its long axis, mother-of-pearl iridescent."