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Noah Webster's 1828 American Dictionary
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T  ›  tetrahedron
T  ›  tetrahedron
1828 Definition

TETRAHE'DRON, n. [Gr. four, and side.] In geometry, a figure comprehended under four equilateral and equal triangles; or one of the five regular Platonic bodies of that figure.

1913 Definition
Tetrahedron (tetrahedron)
n.(?)
Tet`ra*he"dron
[Tetra- + Gr. (?) seat, base, fr. (?) to sit.] (Geom.)
  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 (Geom.), a solid bounded by four equal equilateral triangles; one of the five regular solids.


1828 dictionary
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The duties of men are summarily comprised in the Ten Commandments, consisting of two tables; one comprehending the duties which we owe immediately to God-the other, the duties we owe to our fellow men.
  




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