The Collaborative International Dictionary
Tetrahedral \Tet`ra*he"dral\, a. [See Tetrahedron.]
Having, or composed of, four sides.
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(Crystallog.)
Having the form of the regular tetrahedron.
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Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs.
Tetrahedral angle (Geom.), a solid angle bounded or inclosed by four plane angles.
Wiktionary
a. 1 in the shape of a tetrahedron 2 having four faces, four apices and six edges
Wikipedia
Usage examples of "tetrahedral".
The jellies tried to break and run, but the branchers were too fast for them, swooping around them in a tetrahedral englobement, penning them in.
Martian smectites were aluminosilicates, she found, meaning each unit of the clay had a sheet of aluminum octahedrals sandwiched between two sheets of silicon tetrahedrals.
There were lots of ways to make crystal structures out of the silicon anion, the fundamental silicon-oxygen tetrahedral building block.
They were tetrahedral building blocks of calcium and carbon, the size of poppyseeds, each equipped with a power source, a brain, and a navigational system.
A tangled confusion of barbed wire and tetrahedral clusters of razor-sharp needle-pointed blades was shrouded in a foamy mass of solidified translucent bubbles, through which could be dimly seen the glitter of other, finer wires, of narrow sharp-edged metal strips, and the looming shapes of dark spheres, ovoids, and platelike objects, suggestive of explosive mines.