tetrahedron

American  

[te-truh-hee-druhn] / ˌtɛ trəˈhi drən /

noun

plural

tetrahedrons, tetrahedra

1. Geometry. a solid contained by four plane faces; a triangular pyramid.

2. any of various objects resembling a tetrahedron in the distribution of its faces or apexes.

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tetrahedron British  

/ ˌtɛtrəˈhiːdrən /

noun

1. a solid figure having four plane faces. A regular tetrahedron has faces that are equilateral triangles See also polyhedron

2. any object shaped like a tetrahedron

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tetrahedron Scientific  

/ tĕt′rə-hē′drən /

plural

tetrahedrons

1. A polyhedron having four faces.

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Other Word Forms

• tetrahedral
  adjective
• tetrahedrally
  adverb

Etymology

Origin of tetrahedron

1560–70; tetra- + -hedron, modeled on Late Greek tetráedron, noun use of neuter of tetráedros four-sided

Example Sentences

The Onion’s make-believe owner, Bryce P. Tetraeder, Global Tetrahedron CEO, penned the explainer about why he chose to buy Jones’ reprehensible site.

From Los Angeles Times • Nov. 16, 2024

The real-life Global Tetrahedron is backed by Jeff Lawson, a co-founder and former chief executive of the technology communications company Twilio, according to three people familiar with the matter as well as corporate filings.

From New York Times • Apr. 25, 2024

The name Global Tetrahedron is, in true Onion fashion, a winking reference to a sinister fictional company featured in the book “Our Dumb Century,” which was written by The Onion’s staff and published in 1999.

From New York Times • Apr. 25, 2024

Tetrahedron, tet-ra-hē′dron, n. a solid figure enclosed by four bases or triangles.—adjs.

From Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements) by Various

These are as follows:— The Tetrahedron, having four equilateral triangles as faces.

From Bygone Beliefs: being a series of excursions in the byways of thought by Redgrove, H. Stanley (Herbert Stanley)