# ellipsoid

[ih-lip-soid]

## ellipsoid Definition

a three-dimensional geometric shape resembling a flattened sphere, defined by two axes of different lengths.

## Using ellipsoid: Examples

Take a moment to familiarize yourself with how "ellipsoid" can be used in various situations through the following examples!

• Example

The earth is an ellipsoid.

• Example

The shape of the planet Mars is an ellipsoid.

• Example

The human head can be approximated as an ellipsoid.

## Phrases with ellipsoid

• ### ellipsoidofrevolution

an ellipsoid generated by revolving an ellipse about one of its principal axes

Example

The Earth is an oblate ellipsoid of revolution.

• ### ellipsoidalmirror

a mirror whose reflecting surface is an ellipsoid of revolution

Example

Ellipsoidal mirrors are used in many optical instruments.

• ### ellipsoidalcoordinates

a coordinate system that uses three parameters to define a point in space relative to an ellipsoid

Example

Ellipsoidal coordinates are used in geodesy and navigation.

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## Summary: ellipsoid in Brief

An 'ellipsoid' [ih-lip-soid] is a three-dimensional shape that resembles a flattened sphere, with two axes of different lengths. It is commonly used to describe the shape of planets, celestial bodies, and other objects in space, as well as the human head. The term 'ellipsoid' also encompasses phrases like 'ellipsoid of revolution,' which describes an ellipsoid generated by revolving an ellipse about one of its principal axes, and 'ellipsoidal mirror,' which refers to a mirror whose reflecting surface is an ellipsoid of revolution.

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