## ellipsoid

[e lip**′**so̵id′, i-]

noun

- a solid formed by rotating an ellipse around either axis: its plane sections are all ellipses or circles
- the surface of such a solid

Origin of ellipsoid

French*ellipsoïde*: see ellipse and amp; -oid

adjective

of or shaped like an ellipsoid

## ellipsoid

noun

A geometric surface, all of whose plane sections are either ellipses or circles.

*Related Forms:*

**el·lip′soid′**,**el·lip′soi′dal**adjective

**ellipsoid**

The equation for an ellipsoid is

x2a2 + y2b2 + z2c2 = 1.

## ellipsoid

Noun

(*plural* ellipsoids)

Adjective

(*comparative* more ellipsoid, *superlative* most ellipsoid)

- Shaped like an ellipse; elliptical.
- (mathematics) Of or pertaining to an ellipse.
- (botany) Having the tridimensional shape of an ellipse rotated on its long axis.