from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A geometric curve traced by a fixed point on one circle which rotates around the perimeter of another circle. Examples include the shape of the Wankel engine
from the GNU version of the Collaborative International Dictionary of English
- n. A kind of curve. See epicycloid, any trochoid.
from The Century Dictionary and Cyclopedia
- n. In geometry, the curve traced by a point in the plane of a circle which rolls on the convex side of a fixed circle.
Sorry, no etymologies found.