tetragonal

See also: tétragonal

English

A simple tetragonal shape (2)

Etymology

Etymology tree

Proto-Indo-European *kʷetwóres

Proto-Hellenic *kʷétwores

Ancient Greek τέσσᾰρες (téssăres)

Ancient Greek τετρα- (tetra-)

Proto-Indo-European *ǵónu

Proto-Hellenic *gónu

Proto-Hellenic *-ía

Proto-Hellenic *gonwía

Ancient Greek γωνίᾱ (gōníā)

Proto-Indo-European *-os

Proto-Hellenic *-os

Ancient Greek -ος (-os)

Ancient Greek τετράγωνος (tetrágōnos)bor.

English tetragon

Proto-Indo-European *h₂el-

Proto-Indo-European *-is

Proto-Indo-European *h₂élisder.?

Proto-Italic *-ālis

Latin -ālislbor.

Old French -albor.

▲

Latin -ālis

Old French -elbor.

▲

Latin -ālisbor.

Middle English -al

English -al

English tetragonal

From tetragon + -al.

Pronunciation

• IPA^(key): /tɛˈtɹæɡənəl/

• Audio (Southern England):

  (file)

• Rhymes: -æɡənəl

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°.
   • 1895, Nevil Story-Maskelyne, Crystallography: A Treatise on the Morphology of Crystals, page 255:

     The eight normals of the tetragonal scalenohedron may carry the eight faces of a semiform in other ways than asymmetrically as regards the systematic planes.

Coordinate terms

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

Derived terms

• ditetragonal
• nontetragonal
• tetragonal disphenoid
• tetragonality
• tetragonally

Translations

having two equal axes and one unequal, and all angle 90°

• Bulgarian: тетрагонален (tetragonalen)
• Chinese:

  Mandarin: 四方 (zh) (sìfāng), 正方 (zh) (zhèngfāng)

• Kazakh: тетрагонды (tetragondı)
• Polish: czworokątny (pl), tetragonalny

Catalan

Etymology

From tetràgon +‎ -al.

Pronunciation

• IPA^(key): (Northern, Central) [tə.tɾə.ɣuˈnal]
• IPA^(key): (Balearic) [tə.tɾə.ɣoˈnal]
• IPA^(key): (Valencia, Northwestern) [te.tɾa.ɣoˈnal]

Adjective

tetragonal m or f (masculine and feminine plural tetragonals)

1. tetragonal, quadrilateral

   Synonyms: tetràgon, quadrilàter

Further reading

• “tetragonal”, in Diccionari de la llengua catalana [Dictionary of the Catalan Language] (in Catalan), second edition, Institute of Catalan Studies [Catalan: Institut d'Estudis Catalans], April 2007
• “tetragonal”, in Gran Diccionari de la Llengua Catalana, Grup Enciclopèdia Catalana, 2026
• “tetragonal” in Diccionari normatiu valencià, Acadèmia Valenciana de la Llengua.
• Alcover, Antoni Maria; Moll, Francesc de Borja (1963), “tetragonal”, in Diccionari català-valencià-balear (in Catalan)

Galician

Etymology

Etymology tree

Galician tetrágono

Proto-Indo-European *h₂el-

Proto-Indo-European *-is

Proto-Indo-European *h₂élisder.?

Proto-Italic *-ālis

Latin -ālem

Old Galician-Portuguese -al

Galician -al

Galician tetragonal

From tetrágono + -al.

Adjective

tetragonal m or f (plural tetragonais)

1. tetragonal

Further reading

• “tetragonal”, in Dicionario da Real Academia Galega (in Galician), A Coruña: Royal Galician Academy, 2012–2026

German

Pronunciation

• Audio (Germany (Berlin)):

  (file)

• Rhymes: -aːl

Adjective

tetragonal (strong nominative masculine singular tetragonaler, not comparable)

1. (crystallography) tetragonal

   Synonym: viereckig

Declension

Positive forms of tetragonal (uncomparable)

number & gender		singular			plural
		masculine	feminine	neuter
predicative		er ist tetragonal	sie ist tetragonal	es ist tetragonal	sie sind tetragonal
strong declension (without article)	nominative	tetragonaler	tetragonale	tetragonales	tetragonale
	genitive	tetragonalen	tetragonaler	tetragonalen	tetragonaler
	dative	tetragonalem	tetragonaler	tetragonalem	tetragonalen
	accusative	tetragonalen	tetragonale	tetragonales	tetragonale
weak declension (with definite article)	nominative	der tetragonale	die tetragonale	das tetragonale	die tetragonalen
	genitive	des tetragonalen	der tetragonalen	des tetragonalen	der tetragonalen
	dative	dem tetragonalen	der tetragonalen	dem tetragonalen	den tetragonalen
	accusative	den tetragonalen	die tetragonale	das tetragonale	die tetragonalen
mixed declension (with indefinite article)	nominative	ein tetragonaler	eine tetragonale	ein tetragonales	(keine) tetragonalen
	genitive	eines tetragonalen	einer tetragonalen	eines tetragonalen	(keiner) tetragonalen
	dative	einem tetragonalen	einer tetragonalen	einem tetragonalen	(keinen) tetragonalen
	accusative	einen tetragonalen	eine tetragonale	ein tetragonales	(keine) tetragonalen

Related terms

• trigonal
• hexagonal

Further reading

• “tetragonal”, in Digitales Wörterbuch der deutschen Sprache‎^[1] (in German)
• “tetragonal” in Duden online

Romanian

Etymology

Borrowed from French tétragonale. By surface analysis, tetragon + -al.

Adjective

tetragonal m or n (feminine singular tetragonală, masculine plural tetragonali, feminine/neuter plural tetragonale)

1. tetragonal

Declension

Declension of tetragonal

		singular			plural
		masculine	neuter	feminine	masculine	neuter	feminine
nominative- accusative	indefinite	tetragonal		tetragonală	tetragonali	tetragonale
	definite	tetragonalul		tetragonala	tetragonalii	tetragonalele
genitive- dative	indefinite	tetragonal		tetragonale	tetragonali	tetragonale
	definite	tetragonalului		tetragonalei	tetragonalilor	tetragonalelor

Spanish

Etymology

Etymology tree

Spanish tetrágono

Proto-Indo-European *h₂el-

Proto-Indo-European *-is

Proto-Indo-European *h₂élisder.?

Proto-Italic *-ālis

Latin -ālis

Spanish -al

Spanish tetragonal

From tetrágono + -al.

Pronunciation

• IPA^(key): /tetɾaɡoˈnal/ [t̪e.t̪ɾa.ɣ̞oˈnal]
• Rhymes: -al
• Syllabification: te‧tra‧go‧nal

Adjective

tetragonal m or f (masculine and feminine plural tetragonales)

1. tetragonal

Further reading

• “tetragonal”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), 24th edition, Royal Spanish Academy [Spanish: Real Academia Española], 30 October 2026