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cissoid

[ sis-oid ]

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).


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
“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


adjective

  1. contained between the concave sides of two intersecting curves Compare sistroid
“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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Other Words From

  • cis·soidal adjective
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Word History and Origins

Origin of cissoid1

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

Origin of cissoid1

C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy

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