Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A cylindrical surface or solid, all of whose sections perpendicular to the elements are elliptical.
  • adj. Resembling a cylinder.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • 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.

from the GNU version of the Collaborative International Dictionary of English

  • 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.

from The Century Dictionary and Cyclopedia

  • 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.

Etymologies

cylinder +‎ -oid (Wiktionary)

Examples

  • 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.

    The Boat of a Million Years

  • In a hold, among cases of supplies for the research team on Gwinsai, he was surprised to recognize a lean cylindroid, one hundred twenty centimeters long.

    The Earth Book of Stormgate

  • Under-gravitationally speaking, above-the ship's skin, there was a five-meter space running almost the whole length of the cylindroid.

    Starways

  • She was a big cylindroid, two hundred and forty meters long from the blunt nose to the gravitic focusing cones at the stern, forty meters in diameter.

    Starways

  • A smaller calculus, which has been called coralline, is also cylindroid, with a number of brown, rough, crystalline oxalate of lime branches and whitish depressions of carbonate.

    Special Report on Diseases of the Horse

  • The larger calculi, sometimes weighing 12 to 24 ounces, are molded in the pelvis of the kidney into a cylindroid mass, with irregular rounded swellings at intervals.

    Special Report on Diseases of the Horse

  • In mathematical modeling and experiments testing the efficacy of several conditions: drug or dye with no particles; particles coated with fluorescein dye, positive or negative charge; and particles coated with anti-cancer drug doxorubicin, positive or negative charge, the UMass Amherst researchers show that gold nanoparticles move and localize differently in the 3-D cylindroid tumor tissue, depending on whether the nanoparticles are positively or negatively charged.

    Newswise: Latest News

  • But by experimenting with different payloads carried on the gold nanoparticles in the new tumor cylindroid device,

    Newswise: Latest News

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