Definitions

1. noun

A polyhedron with four triangular faces, six straight edges, and four vertex corners, often considered the simplest three-dimensional shape.

“The mathematician studied the properties of a regular tetrahedron in her research on geometric shapes.”

2. noun

A four-sided solid, especially one having four triangular faces, as the tetrahedron or the diamond.

“The tetrahedron is one of the five regular solids described by the ancient Greek mathematician Plato.”

3. noun

A four-sided figure, especially one used in the art or science of crystallography.

“The crystallographer studied the tetrahedron structure of the crystal lattice.”