spher·​oid ˈsfir-ˌȯid How to pronounce spheroid (audio)
: a figure resembling a sphere
also : an object of approximately spherical shape
spheroidal adjective
or less commonly spheroid
spheroidally adverb

Example Sentences

Recent Examples on the Web Planet Earth is shaped more like an oblate spheroid which looks like a flatter circle. Emy Rodriguez Flores, Popular Mechanics, 10 Jan. 2023 That has a physical difference when gripping an object shaped like a prolate spheroid. Andrew Beaton, WSJ, 27 Jan. 2022 The live feed appears on a spheroid TV that looks like an astronaut’s helmet and directly faces the Buddha. Washington Post, 31 July 2021 Because the Earth rotates, that shape gets compressed at the poles and bulges in the middle, forming a shape known as an oblate spheroid. Ethan Siegel, Forbes, 19 Mar. 2021 To take the curvature of the Earth into account, surveyors used spheroid models—rough, rounder precursors to the more mathematically complex ellipsoid models. Freddie Wilkinson, National Geographic, 28 Sep. 2020 In some cases, material from this disk forms a blob-like spheroid, but the YORP effect continues to shape it. Jennifer Leman, Popular Mechanics, 3 June 2020 But Earth is an oblate spheroid, meaning a 3D shape created by an ellipsis that’s rotating around its shorter axis—like a more rounded jelly donut. Caroline Delbert, Popular Mechanics, 12 Feb. 2020 The nucleus is a prolate spheroid, like a rugby ball, and should lead to discovery of more wobbly isotopes. Caroline Delbert, Popular Mechanics, 12 Feb. 2020 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'spheroid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

First Known Use

1570, in the meaning defined above

Time Traveler
The first known use of spheroid was in 1570

Dictionary Entries Near spheroid

Cite this Entry

“Spheroid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/spheroid. Accessed 27 Jan. 2023.

Kids Definition


spher·​oid ˈsfi(ə)r-ˌȯid How to pronounce spheroid (audio)
: a figure resembling a flattened sphere

More from Merriam-Webster on spheroid

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Commonly Confused Words Quiz

  • vector image of a face with thought expression
  • I went to the ______ store to buy a birthday card.
True or False

Test your knowledge - and maybe learn something along the way.

Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?