tetrahedral

adj. having four triangular surfaces

For the academic journal, see Tetrahedron (journal). A tetrahedron (plural: tetrahedra) is a polyhedron composed of four triangular faces, three of which meet at each vertex. A regular tetrahedron is one in which the four triangles are regular, or "equilateral," and is one of the Platonic solids. The tetrahedron is one kind of pyramid, the second most common type; a pyramid has a flat base, and triangular faces above it, but the base can be of any polygonal shape, not just square or triangular. Like all convex polyhedra, a tetrahedron can be folded from a single sheet of paper.
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(a.)
Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs.
  

(a.)
Having, or composed of, four sides.
  

(a.)
Having the form of the regular tetrahedron.
  

A molecular shape that results when there are four bonds and no lone pairs around the central atom in the molecule. The atoms bonded to the central atom lie at the corners of a tetrahedron with 109.5° angles between them. The ammonium ion (NH4+) has a tetrahedral molecular geometry.

tetrahedral
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