triakis octahedron

noun

A Catalan solid with 24 isosceles triangle faces, 36 edges and 14 vertices, being the dual of the truncated cube.

OriginAncient Greek τριάκις →
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Meanings

nountriakis octahedron (plural triakis octahedra)

plural triakis octahedra

  1. geometryA Catalan solid with 24 isosceles triangle faces, 36 edges and 14 vertices, being the dual of the truncated cube.

    Examined in this way an octahedron of alum (ammonium or potassium) is found to yield, not one, but three images from each face; and closer inspection shows that the crystal is not really an octahedron, but has the form of a very flat triakis-octahedron.

    1903, Henry Woodward, Geological Magazine, page 266

Origin

  1. Ancient Greekτριάκις“thrice”
  2. Englishtriakis octahedron

From Ancient Greek τριάκις (triákis, “thrice”) + English octahedron

More words from Ancient Greek

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Cite this entry
APA

triakis octahedron. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/triakis%20octahedron

MLA

“triakis octahedron.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/triakis%20octahedron. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “triakis octahedron,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/triakis%20octahedron.

Source: triakis octahedron on Wiktionary, CC BY-SA 4.0.