Lexic.us

Definition of Tetrahedron

1. Noun. Any polyhedron having four plane faces.

Definition of Tetrahedron

1. n. A solid figure inclosed or bounded by four triangles.

Definition of Tetrahedron

1. Noun. (geometry) a polyhedron with four faces; the regular tetrahedron, the faces of which are equal equilateral triangles, is one of the Platonic solids. ¹

¹ Source: wiktionary.com

Definition of Tetrahedron

1. [n -DRA or -DRONS]

Medical Definition of Tetrahedron

1. A solid figure inclosed or bounded by four triangles. In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. Regular tetrahedron, a solid bounded by four equal equilateral triangles; one of the five regular solids. Origin: Tetra- + Gr. Seat, base, fr. To sit. Source: Websters Dictionary (01 Mar 1998)

Lexicographical Neighbors of Tetrahedron

Literary usage of Tetrahedron

Below you will find example usage of this term as found in modern and/or classical literature:

1. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1882)
"Then because the quadric circumscribes the first tetrahedron, 6' = 0, ... The locus of the centre of a sphere circumscribing a tetrahedron, self- conjugate ..."

2. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1882)
"But A' = 0 is the condition that the plane x shall touch V. Hence 0' will vanish whenever it is possible to find a tetrahedron self-conjugate with regard to ..."

3. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1874)
"4> = 0 will be fulfilled, if the edges of a self-conjugate tetrahedron, with respect to ... If a sphere be circumscribed about a self-conjugate tetrahedron, ..."

4. Encyclopaedia Britannica: A Standard Work of Reference in Art, Literature (1907)
"If these hydrogen atoms are replaced by atoms of other elements or by compound radicals we should expect a change of form of the tetrahedron. ..."

5. The Encyclopaedia Britannica: A Dictionary of Arts, Sciences, and General by Thomas Spencer Baynes (1888)
"They have twelve longer edges lying in pairs over the edges of the inscribed tetrahedron, and twelve shorter edges, three and three over each of its facea. ..."

6. A Treatise on the Analytic Geometry of Three Dimensions by George Salmon (1862)
"To find the condition that one quadric should pass through the vertices of a self-conjugate tetrahedron with regard to another. ..."

7. Mathematical Crystallography and the Theory of Groups of Movements by Harold Hilton (1903)
"The above converse gives us at once another proof of the theorem that' if any three non-coplanar sides of a tetrahedron represent a primitive triplet, ..."

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