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A solid having four plane triangular faces; a triangular pyramid.
‘Quartz crystals are silicon atoms surrounded by a tetrahedron of oxygen atoms linked at shared corners.’
‘The Enterprise Day at Joseph Rowntree School also involved representatives from The Institute Of Civil Engineers who built a giant tetrahedron with their young charges.’
‘For example, the convex hull of a 3D molecule is a convex polytope rather than a polygon, and it is tessellated by tetrahedra rather than triangles.’
‘In the methane molecule CH 4, for instance, the carbon atom is located at the center of a tetrahedron with the four hydrogen atoms located at the four apexes of the tetrahedron.’
‘These five remarkable solids - tetrahedron, cube, octahedron, dodecahedron, icosahedron - have faces that are congruent equilateral polygons.’
‘The silica tetrahedra may also form a sheet structure where three oxygen atoms of each tetrahedron are shared by adjacent tetrahedra.’
‘The new structure consists of 20 small crystalline tetrahedrons - pyramids with four triangular sides - that fit together a bit like sections of an orange.’
‘As water's temperature decreases to and falls below the normal freezing point, more and more of its molecules self-organize into clusters that have structures based on the tetrahedron, a pyramid with a triangular base.’
‘The strongest and most stable molecular structure is the three-dimensional tetrahedron, the configuration achieved with silicates.’
‘The tetrahedrite crystal on this specimen is a simple tetrahedron with very smooth, clean crystal faces and a bright, shiny metallic gray color (personal observation).’
‘In particular he identified the five elements, fire, earth, air, water and celestial matter with the five regular solids, the tetrahedron, cube, octahedron, icosahedron and the dodecahedron.’
‘Whereas the tetrahedron is composed of four triangles, the pyramid, which looks a lot like it, is composed of four triangles and a square - the base.’
‘He assigned the tetrahedron to fire, because the tetrahedron is the regular solid with the sharpest angles, and because fire is the most penetrating of elements.’
‘The robot is called ‘TETwalker’ for tetrahedral walker, because it resembles a tetrahedron.’
‘Plato believed that atoms have the shapes of regular polyhedra: cubes, tetrahedrons, octahedrons, and so on.’
‘He examined a vectorial system of geometry, Energetic - Synergetic geometry, based on the tetrahedron which provides maximum strength with minimum structure.’
‘When all four corners of the tetrahedra are shared, the mineral is called a tectosilicate.’
‘An artist can look at a mathematical shape and envision unlimited possibilities, even from a shape as seemingly simple as a tetrahedron, a trefoil knot, a Möbius strip, or a fractal surface.’
‘With his geodesic dome, Fuller began to express a favorite geometric shape of his, the tetrahedron, and he put it everywhere he could.’
‘The four C-H bonds are directed towards the four corners of a tetrahedron, with carbon at its center and hydrogens at each vertex.’
Origin
Late 16th century: from late Greek tetraedron, neuter (used as a noun) of tetraedros ‘four-sided’.