- a curve having a cusp at the origin and a point of inflection at infinity. Equation: r = 2a sin(θ)tan(θ).
Origin of cissoid
1650–60; < Greek kissoeidḗs, equivalent to kiss(ós) ivy + -oeidēs -oid
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a geometric curve whose two branches meet in a cusp at the origin and are asymptotic to a line parallel to the y -axis. Its equation is y ²(2a – x) =x ³ where 2a is the distance between the y -axis and this line
- contained between the concave sides of two intersecting curvesCompare sistroid
C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy