from The Century Dictionary.

  • Same as cycloid.
  • Of or pertaining to a cycloid; of the nature of a cycloid: as, the cycloidal space (that is, the space contained between the cycloid and its base).

from the GNU version of the Collaborative International Dictionary of English.

  • adjective Pertaining to, or resembling, a cycloid.
  • adjective See Geometric lathe.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective pertaining to or resembling a cycloid; or a circle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adjective resembling a circle


Sorry, no etymologies found.


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  • The house is situated rather low in a very extensive park, near a noble piece of water, over which is a very handsome bridge on 'cycloidal' arches.

    The Dukeries

  • Newton recognized this concern and addressed it in Propositions 48 through 52 by extending Huygens's theory of the cycloidal pendulum to cover the hypocycloidal pendulum ” that is, a cycloidal path produced when the generating circle rolls along the inside of a sphere instead of along a flat surface.

    Newton's Philosophiae Naturalis Principia Mathematica

  • The illustrations include photographs of lathes and chucks, engravings from 19th century magazines, and plates of cycloidal patterns produced by substituting paper for the material to be turned and a pencil or pen for the cutting tool.

    Making Light: Open thread 135

  • The coordinate system is constructed in such a way that each of these particles has a constant radial coordinate throughout its “cycloidal life”.

    Arrow of Time FAQ

  • This theory-mediated measurement was based on the isochronism [36] of the cycloidal pendulum under uniform gravity directed in parallel lines toward a flat Earth.

    Newton's Philosophiae Naturalis Principia Mathematica

  • A corollary to this proposition goes further by pointing out that, as the radius of the sphere is increased indefinitely, its surface approaches a plane surface and the law of the hypocycloidal asymptotically approaches Huygens's law of the cycloidal pendulum.

    Newton's Philosophiae Naturalis Principia Mathematica

  • Regrav capsules slipped effortlessly through the air above it in strictly maintained traffic streams, long horizontals bands of fast motion winding up into cycloidal junctions that knitted the city together in a pulsing kinetic dance.

    The Dreaming Void

  • "Do you call that a cycloidal curve?" asked Madame, with a contralto laugh that shook the library.

    The Prophet of Berkeley Square

  • The cycloidal curve might have been made by a Board School child.

    The Prophet of Berkeley Square

  • "You will trace the cycloidal curve of the planets -- can you do that?"

    The Prophet of Berkeley Square


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