deltahedron
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English
[edit]
Etymology
[edit]From delta (Greek letter) + -hedron referring to the triangular shape of the letter.
Noun
[edit]deltahedron (plural deltahedrons or deltahedra)
- (geometry) A polyhedron whose faces are all equilateral triangles.
- There are infinitely many deltahedra, but only eight that are convex.
Usage notes
[edit]- Not to be confused with the deltohedron, whose faces are kites.