deltahedron

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noun

A polyhedron whose faces are all equilateral triangles.

“There are infinitely many deltahedra, but only eight that are convex.”

Scrabble 16
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Meanings

noundeltahedron (plural deltahedrons or deltahedra)

plural deltahedrons · plural deltahedra

  1. geometryA polyhedron whose faces are all equilateral triangles.

    There are infinitely many deltahedra, but only eight that are convex.

Origin

From delta (Greek letter) + -hedron referring to the triangular shape of the letter.

Full word history & related roots →
Cite this entry
APA

deltahedron. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/deltahedron

MLA

“deltahedron.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/deltahedron. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “deltahedron,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/deltahedron.

Source: deltahedron on Wiktionary, CC BY-SA 4.0.