Tetrahedral (adjective)

Having the shape of a tetrahedron, which is a polyhedron with four triangular faces.

Origin:

Derived from the greek words 'tetra' meaning 'four' and 'hedron' meaning 'a face or a solid', first used in the 19th century.

Examples:

1. The tetrahedral carbon atom is the building block of organic molecules.
2. The crystal structure was found to have a tetrahedral shape.
3. The tetrahedral pyramid is one of the five regular polyhedra.
4. The tetrahedral coordination is a common arrangement in coordination chemistry.
5. The molecular geometry of water is tetrahedral due to the arrangement of its electrons.