deltahedron

== English == === Etymology === From delta (Greek letter) +‎ -hedron referring to the triangular shape of the letter. === Pronunciation === === Noun === deltahedron (plural deltahedrons or deltahedra) (geometry) A polyhedron whose faces are all equilateral triangles. ==== Usage notes ==== Not to be confused with the deltohedron, whose faces are kites. ==== Related terms ==== deltahedral === Anagrams === on the ladder