ellipˈsograph noun

An instrument for drawing ellipses

ellipˈsoid noun (geometry)

1. A surface of which every plane section is an ellipse or a circle
2. A solid object of this shape

ellipsoiˈdal adjective

ellipˈtic or ellipˈtical adjective

1. Of or relating to an ellipse
2. Oval
3. Having a part understood
4. Concise or comprehensive
5. Obscure or dubious
6. (loosely) circumlocutory
7. Rather narrow, slightly acute at each end and broadest in the middle (botany)
8. Of or relating to ellipsis

ellipˈtically adverb

ellipticity /el-ip-tisˈi-ti/ noun

1. Deviation from the form of a circle or sphere
2. The difference between the equatorial and polar diameters of the earth

elliptic geometry or elliptic space noun

Riemannian geometry or space