Definition of "cycloidal" [cy•cloid•al]

• Pertaining to or resembling a cycloid; or a circle. (adjective)

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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."
• "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."
• "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."