Adjective
Having, or composed of, four sides.
Having the form of the regular tetrahedron.
Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs.
Source: Webster's dictionaryToday, no less than in the past, the tetrahedral form of the earth and the relation of the tetrahedron to the poles and to the equator preserve the conditions that favor rapid evolution. Ellsworth Huntington
Also, in part due to self-duality of the tetrahedron, only one Archimedean solid has only tetrahedral symmetry. Source: Internet
Alternately, the numbers on a tetrahedral die can be placed at the middles of the edges, in which case the numbers around the base are read. Source: Internet
Bell's coffin was constructed of Beinn Bhreagh pine by his laboratory staff, lined with the same red silk fabric used in his tetrahedral kite experiments. Source: Internet
Because the fluorine and chlorine atoms differ greatly in size and effective charge from hydrogen and from each other, the methane-derived CFCs deviate from perfect tetrahedral symmetry. Source: Internet
By contrast, the modern structure of (meta) periodic acid has all four oxygen atoms surrounding the iodine in a tetrahedral geometry. Source: Internet