1. Plural of cissoid; a family of plane curves in mathematics, each generated by a specific geometric construction involving a fixed point, a line, and a circle.
Usage: mathematics; technical; plural form

Examples

• The cissoids studied in advanced geometry courses demonstrate important properties of algebraic curves.
• Mathematicians use cissoids to model certain types of motion and structural problems.
• The family of cissoids includes the famous cissoid of Diocles, known since ancient times.
• Cissoids appear frequently in differential geometry and curve theory textbooks.