# tetragonal

[te-trag-uh-nl] /tɛˈtræg ə nl/
1.
pertaining to or having the form of a tetragon.
2.
Crystallography. noting or pertaining to a system of crystallization in which all three axes are at right angles to one another, two being equal in length and the third being of a different length.
Compare crystal system.
Origin of tetragonal
1565-1575
1565-75; tetragon + -al1
Related forms
tetragonalness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for tetragonal
Historical Examples
• In the tetragonal system there are three axes at right angles to each other.

Charles A. Bramble
• Pligot obtained it as minute tetragonal octahedra and cubes by reducing ferrous chloride in hydrogen.

• It crystallises in the 3rd (tetragonal) system, with indistinct cleavage.

• Optically uniaxial crystals—corresponding with the tetragonal and hexagonal systems.

• tetragonal scalenohedron or ditetragonal bisphenoid (fig. 51).

• Meshes subregular, pentagonal, intermingled with a small number of tetragonal and hexagonal meshes.

• It consists of tin dioxide, or stannic oxide (SnO2), and crystallizes in the tetragonal system.

• Though closely resembling the tetragonal torbernite in form, it crystallizes in the orthorhombic system and is optically biaxial.

• Meshes of the network irregularly polygonal, the majority pentagonal or tetragonal.

• The density and specific heat of the tetragonal form are greater than those of the yellow.

British Dictionary definitions for tetragonal

## tetragonal

/tɛˈtræɡənəl/
1.
(crystallog) Also dimetric. relating or belonging to the crystal system characterized by three mutually perpendicular axes of which only two are equal
2.
of, relating to, or shaped like a quadrilateral
Derived Forms
tetragonalness, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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tetragonal in Science
 tetragonal   (tě-trāg'ə-nəl)    Relating to a crystal having three axes, two of which are of the same length and are at right angles to each other. The third axis is perpendicular to these. The mineral zircon has tetragonal crystals. See illustration at crystal.
The American Heritage® Science Dictionary