different between tetragonal vs disphenoid

English

Etymology

tetragon +? -al

Adjective

tetragonal (not comparable)

1. Having four sides, like a tetragon.

   Synonym: quadrilateral

2. (crystallography) Having two equal axes and one unequal, and all angles 90°.

Coordinate terms

• triclinic
• monoclinic
• orthorhombic
• hexagonal
• rhombohedral
• cubic

Derived terms

• ditetragonal
• tetragonal disphenoid

Translations

Catalan

Etymology

tetràgon +? -al

Pronunciation

• (Balearic) IPA^(key): /t?.t??.?o?nal/
• (Central) IPA^(key): /t?.t??.?u?nal/
• (Valencian) IPA^(key): /te.t?a.?o?nal/

Adjective

tetragonal (masculine and feminine plural tetragonals)

1. tetragonal, quadrilateral

   Synonyms: tetràgon, quadrilàter

Further reading

• “tetragonal” in Diccionari de la llengua catalana, segona edició, Institut d’Estudis Catalans.
• “tetragonal” in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana.
• “tetragonal” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.
• “tetragonal” in Diccionari català-valencià-balear, Antoni Maria Alcover and Francesc de Borja Moll, 1962.

Galician

Etymology

tetrágono +? -al

Adjective

tetragonal m or f (plural tetragonais)

1. tetragonal

Further reading

• “tetragonal” in Dicionario da Real Academia Galega, Royal Galician Academy.

German

Pronunciation

• Rhymes: -a?l

Adjective

tetragonal (not comparable)

1. (crystallography) tetragonal

Declension

Synonyms

• viereckig

Related terms

• trigonal
• hexagonal

Further reading

• “tetragonal” in Digitales Wörterbuch der deutschen Sprache
• “tetragonal” in Duden online

Romanian

Etymology

From French tétragonale

Adjective

tetragonal m or n (feminine singular tetragonal?, masculine plural tetragonali, feminine and neuter plural tetragonale)

1. tetragonal

Declension

Spanish

Etymology

tetrágono +? -al

Pronunciation

• IPA^(key): /tet?a?o?nal/, [t?e.t??a.??o?nal]

Adjective

tetragonal (plural tetragonales)

1. tetragonal

Further reading

• “tetragonal” in Diccionario de la lengua española, Vigésima tercera edición, Real Academia Española, 2014.

English

Etymology

From di- (“twice, double”) +? sphenoid (“wedge-shaped crystal or bone of the skull”).

Adjective

disphenoid (not comparable)

1. (mineralogy) Of or pertaining to a wedge-shaped crystal form of the tetragonal or orthorhombic system.
2. (mineralogy) Of or pertaining to a crystal form bounded by eight scalene triangles arranged in pairs, constituting a tetragonal scalenohedron.

Noun

disphenoid (plural disphenoids)

1. (geometry) A non-regular tetrahedron whose four faces are congruent acute-angled triangles.
   • 1973, H. S. M. Coxeter, 3rd Edition, unnumbered page,

     To make a model of a disphenoid, cut out an acute angled triangle and fold it along the joins of the mid-points of the sides. The disphenoid is said to be rhombic or tetragonal according as the triangle is isosceles or scalene.

   • 1977, Elizabeth A. Wood, Crystals and Light: An Introduction to Optical Crystallography, 2nd Revised Edition, page 8,

     If you rotate the [tetragonal] disphenoid 90° around its 2-fold axis and then perform the operation of inversion through the center-point of the object, it will occupy its original position again.

   • 1993, Horst Martini, A Hierarchical Classification of Euclidean Polytopes with Regularity Properties, Tibor Bisztriczky, Peter McMullen, Rolf Schneider, Asia Ivic Weiss (editors), Polytopes: Abstract, Convex and Computational, Proceedings of the NATO Advanced Study Institute, page 83,

     In addition it should be remarked that there are two types of disphenoids, with different symmetries: the tetragonal disphenoid (having isosceles facets) and the rhombic one.

Synonyms

• (non-regular tetrahedron with congruent faces): bisphenoid, equifacial tetrahedron, isosceles tetrahedron

Derived terms

• rhombic disphenoid
• snub disphenoid
• tetragonal disphenoid