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


Nearby words

  1. elliot's operation,
  2. elliott,
  3. ellipse,
  4. ellipsis,
  5. ellipsograph,
  6. ellipsoid of revolution,
  7. ellipsoidal,
  8. ellipsoidal joint,
  9. ellipsometer,
  10. ellipt

Origin of ellipsoid

From the French word ellipsoïde, dating back to 1715–25. See ellipse, -oid

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ellipsoid


British Dictionary definitions for ellipsoid

ellipsoid

/ (ɪˈlɪpsɔɪd) /

noun

  1. 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
  2. a solid having this shapethe earth is an ellipsoid
Derived Formsellipsoidal (ɪlɪpˈsɔɪdəl, ˌɛl-), adjective

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

Word Origin and History for ellipsoid

ellipsoid

n.

1721; see ellipse + -oid. From 1861 as an adjective (earlier adjective was ellipsoidal).

Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for ellipsoid

ellipsoid

[ ĭ-lĭpsoid′ ]

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.