Definition of "hypocycloid" []

• The plane locus of a point fixed on a circle that rolls on the inside circumference of a fixed circle. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "The result is a series of enormous hypocycloid designs which recorded the hidden patterns created by the ride as it turned."
• "The properties of a hypocycloid were recognized by James White, an"
• "Thus in Fig. 39, the diameters of the two pitch circles are to each other as 4 to 5; the hypocycloid has 5 branches, and 4 pins are used."