polhode
/ˈpɒlhəʊd/Geometry and Physics
noun
A non-plane curve traced on the surface of an ellipsoid by its point of contact with a plane on which it rolls (or notionally rolls) without slipping.
Origin
Mid 19th century; earliest use found in Proceedings of the Royal Society of London. From French polhodie from ancient Greek πόλος + ὁδός way, path.