cissoid

cissoid

[sis-oid]
noun Geometry.
a curve having a cusp at the origin and a point of inflection at infinity. Equation: r = 2 a sin(θ)tan(θ).

Origin:
1650–60; < Greek kissoeidḗs, equivalent to kiss(ós) ivy + -oeidēs -oid

cissoidal, adjective
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cissoid (ˈsɪsɔɪd)
 
n
1.  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 y²(2a -- x)=x³ where 2a is the distance between the y-axis and this line
 
adj
2.  Compare sistroid contained between the concave sides of two intersecting curves
 
[C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy]

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