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).

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

cissoidal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cissoid
World English Dictionary
cissoid (ˈsɪsɔɪd)
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
2.  Compare sistroid contained between the concave sides of two intersecting curves
[C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
Copyright © 2014, LLC. All rights reserved.
  • Please Login or Sign Up to use the Recent Searches feature