What does "cissoid" mean?

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, C₁ and C₂, where the distance along the line from C₁ to P remains constant and equal to the distance from P to C₂.

Cissoid

noun

noun ·Rare ·Advanced level

Definitions

Noun

1
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, C₁ and C₂, where the distance along the line from C₁ to P remains constant and equal to the distance from P to C₂.
"The cissoid of a circle and a line is a conchoid"
2
A cisgender person. derogatory
"I feel very similar, I don’t ever see myself with a cissoid and I think there is something beautiful about t4t, and every day I am st4t is this truth reinforced. And I always love fellow bisexuals :}"

Example

More examples

"The cissoid of a circle and a line is a conchoid"

Etymology

Etymology 1

From Ancient Greek κισσός (kissós, “ivy”) + εἶδος (eîdos, “form, image”).

Etymology 2

From cis + -oid.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.