| 释义 |
cassinoid Geom.|ˈkæsɪnɔɪd|
[a. F. cassinoide: see cassinian and -oid.]
A curve which Cassini wished to substitute for the ellipse, in explanation of the planetary movements: an oval having two foci, such that the product of the focal radii of any point on the curve is constant (instead of their sum being constant as in the ellipse). |