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cissoid

[sis-oid] /ˈsɪs ɔɪd/
noun, Geometry
1.
a curve having a cusp at the origin and a point of inflection at infinity. Equation: r = 2 a sin(θ)tan(θ).
Origin
1650-1660
1650-60; < Greek kissoeidḗs, equivalent to kiss(ós) ivy + -oeidēs -oid
Related forms
cissoidal, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for cissoid

cissoid

/ˈsɪsɔɪd/
noun
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
adjective
2.
contained between the concave sides of two intersecting curves Compare sistroid
Word Origin
C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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