heptagonal

English

Etymology

Since 16th century, from heptagon +‎ -al.

Pronunciation

• IPA^(key): /hɛpˈtæɡənəl/

• Audio (Canada):

  (file)

• Rhymes: -æɡənəl

Adjective

heptagonal (not comparable)

1. Having seven angles and sides.
2. (mathematics, of a number) Belonging to the sequence generated by the formula ${\displaystyle {\frac {5n^{2}-3n}{2}}}$.

Synonyms

• septagonal

Derived terms

• heptagonally

Related terms

• heptagon
• septangle
• septangular

Translations

Having seven angles and sides

Asturian: heptagonal, heptágonu Bengali: সপ্তভুজাকৃতি (śoptobhujakriti) Catalan: heptagonal (ca) Dutch: zevenhoekig (nl) Esperanto: seplatera, sepangula French: heptagone (fr), heptagonal (fr) Galician: heptagonal Georgian: შვიდკუთხა (švidḳutxa) German: siebeneckig (de) Greek: επτάγωνος (eptágonos), εφτάγωνος (eftágonos) Hebrew: משובע m (meshubá), משובעת f (meshubá`at) Icelandic: sjöhyrndur m Italian: ettagono (it), ettagonale Polish: siedmiokątny Portuguese: heptagonal, heptágono (pt) Russian: семиугольный (ru) (semiugolʹnyj) Scottish Gaelic: seachd-shliosach Serbo-Croatian: sedmougaoni, sedmokrak Slovak: sedemuholníkový Spanish: heptagonal (es), heptágono (es) Tagalog: pitsihain Ukrainian: семику́тний (semykútnyj)

Anagrams

• paleognath

Asturian

Adjective

heptagonal (epicene, plural heptagonales)

1. heptagonal (having seven angles and sides)

Synonyms

• heptágonu

Catalan

Etymology

From heptàgon +‎ -al.

Pronunciation

• IPA^(key): (Central) [əp.tə.ɣuˈnal]
• IPA^(key): (Balearic) [əp.tə.ɣoˈnal]
• IPA^(key): (Valencia) [ep.ta.ɣoˈnal]

Adjective

heptagonal m or f (masculine and feminine plural heptagonals)

1. heptagonal

French

Pronunciation

• Audio (France (Lyon)):

  (file)

Adjective

heptagonal (feminine heptagonale, masculine plural heptagonaux, feminine plural heptagonales)

1. heptagonal

Further reading

• “heptagonal”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

Portuguese

Pronunciation

 

• (Brazil) IPA^(key): /ˌɛ.pi.ta.ɡoˈnaw/ [ˌɛ.pi.ta.ɡoˈnaʊ̯], /ˌɛp.ta.ɡoˈnaw/ [ˌɛp.ta.ɡoˈnaʊ̯]

• (Brazil) IPA^(key): /ˌɛ.pi.ta.ɡoˈnaw/ [ˌɛ.pi.ta.ɡoˈnaʊ̯], /ˌɛp.ta.ɡoˈnaw/ [ˌɛp.ta.ɡoˈnaʊ̯]
  • (Southern Brazil) IPA^(key): /ˌɛp.ta.ɡoˈnaw/ [ˌɛp.ta.ɡoˈnaʊ̯], /ˌɛ.pi.ta.ɡoˈnaw/ [ˌɛ.pi.ta.ɡoˈnaʊ̯]

 

• (Portugal) IPA^(key): /ˌɛ.ptɐ.ɡuˈnal/ [ˌɛ.ptɐ.ɣuˈnaɫ]

• (Portugal) IPA^(key): /ˌɛ.ptɐ.ɡuˈnal/ [ˌɛ.ptɐ.ɣuˈnaɫ]
  • (Southern Portugal) IPA^(key): /ˌɛ.ptɐ.ɡuˈna.li/ [ˌɛ.ptɐ.ɣuˈna.li]

• Hyphenation: hep‧ta‧go‧nal

Adjective

heptagonal m or f (plural heptagonais)

1. heptagonal (having seven angles and sides)

   Synonym: heptágono

Further reading

• “heptagonal”, in Dicionário Aulete Digital (in Portuguese), Rio de Janeiro: Lexikon Editora Digital, 2008–2025
• “heptagonal”, in Dicionário Priberam da Língua Portuguesa (in Portuguese), Lisbon: Priberam, 2008–2025

Romanian

Etymology

Borrowed from French heptagonal. By surface analysis, heptagon +‎ -al.

Adjective

heptagonal m or n (feminine singular heptagonală, masculine plural heptagonali, feminine/neuter plural heptagonale)

1. heptagonal

Declension

Declension of heptagonal

		singular				plural
		masculine	neuter	feminine		masculine	neuter	feminine
nominative- accusative	indefinite	heptagonal		heptagonală		heptagonali	heptagonale
	definite	heptagonalul		heptagonala		heptagonalii	heptagonalele
genitive- dative	indefinite	heptagonal		heptagonale		heptagonali	heptagonale
	definite	heptagonalului		heptagonalei		heptagonalilor	heptagonalelor

Spanish

Pronunciation

• IPA^(key): /ebtaɡoˈnal/ [eβ̞.t̪a.ɣ̞oˈnal]
• Rhymes: -al
• Syllabification: hep‧ta‧go‧nal

Adjective

heptagonal m or f (masculine and feminine plural heptagonales)

1. heptagonal

   Synonym: heptágono

Further reading

• “heptagonal”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025