tetrahedron


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tetrahedron:

see polyhedronpolyhedron
, closed solid bounded by plane faces; each face of a polyhedron is a polygon. A cube is a polyhedron bounded by six polygons (in this case squares) meeting at right angles.
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Tetrahedron

A polygon with four plane surfaces.

Tetrahedron

 

(or triangular pyramid), a polyhedron with four triangular faces, six edges, and four vertices. At each vertex three edges intersect. The regular tetrahedron (Figure 1) is one

Figure 1

of the five regular polyhedrons. If a is the length of an edge of a regular tetrahedron, the volume of the tetrahedron is Tetrahedron.

tetrahedron

[‚te·trə′hē·drən]
(crystallography)
An isometric crystal form in cubic crystals, in the shape of a four-faced polyhedron, each face of which is a triangle.
(mathematics)
A four-sided polyhedron.

tetrahedron

tetrahedron
A device to indicate wind direction, and, in turn, landing direction. It is tetrahedronshaped—four triangular sides. This device is generally located at uncontrolled airports. The small end of a tetrahedron points in the direction of landing. At controlled airports, the tetrahedron should be disregarded because tower instructions supercede the indicator. On approach charts, a tetrahedron is shown as.

tetrahedron

1. a solid figure having four plane faces. A regular tetrahedron has faces that are equilateral triangles
2. any object shaped like a tetrahedron
References in periodicals archive ?
Professor Stephen Martin, Chairman of the Editorial Board of Tetrahedron Journals, said on announcing this year's winner, "The Tetrahedron Prize for 2015 honors Professor William Jorgensen of Yale University for his outstanding contributions to the general field of computational chemistry and its applications to organic and medicinal chemistry, including chemical reactions, host-guest interactions, protein-ligand interactions, and drug discovery.
By application of the Gauss divergence theorem to the tetrahedron, one can write:
If a microscopic droplet of water is cooled very fast, it forms what is called a glass -- low-density amorphous ice -- in which all the tetrahedrons of water molecules are not lined up to form perfect crystals.
We're basically turning that on its head," says Julie Zimmerman, also of Yale and a coauthor of the paper in Tetrahedron.
But colour yellow scored poorly for all shapes with one exception: the tetrahedron.
Note that for every boundary triangle f [member of] F, there exists exactly one tetrahedron [[tau].
This flower is self-dual, like the tetrahedron it is similar to, and so a dual ASTER, interchanging nodes with 4-cycles and lines with 3-cycles could be superimposed on the graph.
4-O-Benzyl-2,3-O-isopropylidene-L-threose: A Useful Building Block for Stereoselective Synthesis of Monosaccharides, Tetrahedron, 46:265-276.
To have a fire, the necessary legs of the fire tetrahedron must all be present: heat, oxygen and fuel.
The cube, tetrahedron, and dodecahedron are attributed to Pythagoreans while the octahedron and the icosahedron are attributed to the mathematician Theaetetus.