hypocycloidal

[hahy-puh-sahy-kloid]

hy·po·cy·cloid

[hahy-puh-sahy-kloid]
noun Geometry.
a curve generated by the motion of a point on the circumference of a circle that rolls internally, without slipping, on a given circle.

Origin:
1835–45; hypo- + cycloid

hy·po·cy·cloi·dal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Hypocycloidal is always a great word to know.
So is quincunx. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
hypocycloid (ˌhaɪpəˈsaɪklɔɪd)
 
n
epicycloid Compare cycloid a curve described by a point on the circumference of a circle as the circle rolls around the inside of a fixed coplanar circle
 
hypocy'cloidal
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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