Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun The curve described by a point on the circumference of a circle as the circle rolls on the outside of the circumference of a second, fixed circle.

from The Century Dictionary.

  • noun In geometry, a curve generated by the motion of a point on the circumference of a circle which rolls upon the convex side of a fixed circle. These curves were invented by the Danish astronomer Roemer in 1674.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Geom.) A curve traced by a point in the circumference of a circle which rolls on the convex side of a fixed circle.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun geometry The locus of a point on the circumference of a circle that rolls without slipping on the circumference of another circle.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a line generated by a point on a circle rolling around another circle

Etymologies

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