cissoid

/sis-oid/US // ˈsɪs ɔɪd //UK // (ˈsɪsɔɪd) //

娘娘腔,鱼鳞状,梭形,母系

Definitions

n.名词 noun

1
Geometry.
- : a curve having a cusp at the origin and a point of inflection at infinity. Equation: r = 2a sintan.