# deltahedron

## EnglishEdit

### NounEdit

**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 notesEdit

- Not to be confused with the
*deltohedron*, whose faces are kites.