# ellipsoid

[ ih-lip-soid ]

/ ɪˈlɪp sɔɪd /

### noun

Geometry. a solid figure all plane sections of which are ellipses or circles. Typical equation: (x2/a2) + (y2/b2) + (z2/c2) = 1.

### adjective

## QUIZZES

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Commas mark divisions in sentences. Periods end declarative sentences. Apostrophes show possession. Easy, right? Well, punctuation can get pretty tricky—fast. Think you got what it takes to be a punctuation expert? Take our quiz to prove it!

Question 1 of 10

Which of the options below is the best punctuation for the sentence? It__s your turn to pick the movie __ but your sister gets to pick the board game we _ re going to play.

Its your turn to pick the movie but your sister gets to pick the board game we’re going to play.

It’s your turn to pick the movie but your sister gets to pick the board game were going to play.

It’s your turn to pick the movie, but your sister gets to pick the board game we’re going to play.

TAKE THE QUIZ TO FIND OUT## Words nearby ellipsoid

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

## Example sentences from the Web for ellipsoid

## British Dictionary definitions for ellipsoid

ellipsoid

/ (ɪˈlɪpsɔɪd) /

### noun

- a geometric surface, symmetrical about the three coordinate axes, whose plane sections are ellipses or circles. Standard equation: x ²/ a ² + y ²/ b ² + z ²/ c ² = 1, where ± a, ± b, ± c are the intercepts on the x-, y-, and z- axes
- a solid having this shapethe earth is an ellipsoid

## Derived forms of ellipsoid

ellipsoidal (ɪlɪpˈsɔɪdəl, ˌɛl-), adjectiveCollins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## Scientific definitions for ellipsoid

ellipsoid

[ ĭ-lĭp′soid′ ]

A three-dimensional geometric figure resembling a flattened sphere. Any cross section of an ellipsoid is an ellipse or circle. An ellipsoid is generated by rotating an ellipse around one of its axes.

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.