cissoid

(ˈsɪsɔɪd)

(Mathematics) 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

adj

(Mathematics) contained between the concave sides of two intersecting curves. Compare sistroid

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

Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

Mentioned in

sistroid

References in periodicals archive

It can be seen from the trends of the international market that foreign automotive semiconductor vendors have set about seeking for long-term partnerships with SiC wafer suppliers; in the Chinese market, the collaborations between the Institute of Electrical Engineering (IEE) of Chinese Academy of Sciences (CAS), Tsinghua University and Belgium's CISSOID in 2019, are a boon for massive application of SiC devices to new energy vehicles.

China Silicon Carbide Markets, 2019-2025: Combination of Factors Such as Technological Advances, Favorable Policies, and Growing Demand Will Prop the Industry to Soar

Along the way the curves known as the conchoid and the cissoid were discovered.

The Delian Problem

The profile of an old, buttressed eucalypt approaches the curve known as cissoid. The tree is thin-skinned and susceptible to scorching by fire, the greater portion of the trunk decorticating in long, thin flakes or ribbons, which taper in thickness from one-eighth or one-tenth of an inch to nothing where they run off above, while about the base and often on the lower fifth, fourth, or even third part of the trunk the rougher bark persists.

98 years ago: The Tall Trees of Australia

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