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
adjective
2.
contained between the concave sides of two intersecting curves
Compare sistroid
Word origin
C17: from Greek kissoeidēs, literally: ivy-shaped, from kissos ivy
cissoid in American English
(ˈsɪsˌɔɪd)
noun
1. Ancient Mathematics
a curve converging into a pointed tip
adjective
2.
designating the angle formed by the concave sides of two intersecting curves
see also sistroid
Word origin
Gr kissoeidēs, ivylike < kissos, ivy + eidos, -oid