ellipsoid

American  

[ih-lip-soid] / ɪˈlɪp sɔɪd /

noun

1. Geometry. a solid figure all plane sections of which are ellipses or circles. Typical equation: (x 2 / a2 ) + (y 2 / b2 ) + (z 2 / c2 ) = 1.

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adjective

1. ellipsoidal.

ellipsoid British  

/ ɪˈlɪpsɔɪd, ɪlɪpˈsɔɪdəl, ˌɛl- /

noun

1. 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 shape

      the earth is an ellipsoid

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ellipsoid Scientific  

/ ĭ-lĭp′soid′ /

1. 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.

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Other Word Forms

• ellipsoidal
  adjective

Etymology

Origin of ellipsoid

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

Example Sentences

At the start of the experiment, the team molded the clay into a "half ellipsoid" or half of an oval shape.

From Scientific American • Nov. 11, 2023

This is because the Earth is not shaped like a perfect sphere but rather closer to an ellipsoid, with its thickness from the equator being roughly 70,000 feet wider than from the poles.

From Salon • Jul. 26, 2023

Dissecting these death-exposed flies revealed activity in the ellipsoid body, which integrates sensory information in the brain.

From New York Times • Jun. 13, 2023

The displacement parameter for the atomic position C6C corresponds to a strongly flattened ellipsoid.

From Nature • Mar. 28, 2017

Why was it necessary to calculate an error ellipsoid to accurately predict the satellite’s return to the planet’s surface?

From "Hidden Figures" by Margot Lee Shetterly