Blend of circle +‎ cycloid

circloid (plural circloids)

1. (mathematics) A variant of a cycloid being the locus of a point on a circle that rolls around another circle
   • 2015, Andres Koropecki, “Realizing rotation numbers on annular continua”, in arXiv‎:

     Our second result shows that if the continuum ${\displaystyle K}$ is minimal with the property of being annular (what we call a circloid), then every rational number between the extrema of the rotation set in ${\displaystyle K}$ is realized by a periodic orbit in ${\displaystyle K}$.