cissoid

[ sis-oid ]

nounGeometry.
  1. 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

1
1650–60; <Greek kissoeidḗs, equivalent to kiss(ós) ivy + -oeidēs-oid

Other words from cissoid

  • cis·soi·dal, adjective

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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 y ²(2a – x) =x ³ where 2a is the distance between the y -axis and this line

adjective
  1. contained between the concave sides of two intersecting curves: Compare sistroid

Origin of cissoid

1
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