Dictionary.com

cissoid

[ sis-oid ]
/ ˈsɪs ɔɪd /
Save This Word!

noun Geometry.

a curve having a cusp at the origin and a point of inflection at infinity. Equation: r = 2a sin(θ)tan(θ).

QUIZZES

QUIZ YOURSELF ON AFFECT VS. EFFECT!

In effect, this quiz will prove whether or not you have the skills to know the difference between “affect” and “effect.”
Question 1 of 7
The rainy weather could not ________ my elated spirits on my graduation day.

Origin of cissoid

1650–60; <Greek kissoeidḗs, equivalent to kiss(ós) ivy + -oeidēs-oid
cis·soi·dal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for cissoid

cissoid
/ (ˈsɪsɔɪd) /

noun

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

contained between the concave sides of two intersecting curvesCompare sistroid
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
Learning At Home Just Got Easier!