# cissoid

Definition from Wiktionary, the free dictionary

## English[edit]

### Etymology[edit]

Ancient Greek *κίσσος* (“ivy”) + *εἶδος* (“like”)

### Noun[edit]

**cissoid** (*plural* **cissoids**)

- (geometry) Any of a family of curves defined as the locus of a point,
*P*, on a line from a given fixed point and intersecting two given curves,*C*_{1}and*C*_{2}, where the distance along the line from*C*_{1}to*P*remains constant and equal to the distance from*P*to*C*_{2}.*The***cissoid**of a circle and a line is a conchoid

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*Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.*