See Also: Tetrahedron(medicine)
tetrahedron(dictionary)

tetrahedron (iou)



tetrahedron noun. , -drons. L16.
[Late Greek tetraedron, use as noun of neut. of tetraedros four-sided: see TETRA-, -HEDRON.]
A solid figure or object with four plane faces; a triangular pyramid; esp. (more fully regular tetrahedron) one with four equal equilateral triangular faces.