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.
   • 2026 September 30, David Jukes, “London Underground buildings”, in RAIL, number 1071, page 57, concerning Hounslow West tube station:

     The heptagonal drum ticket hall and flanking shop units are a development of Holden's architectural style used on the Northern Line's Morden extension (Ealing Common is of a similar design) with Portland stone cladding and glazed screens retained from those.

2. (mathematics, of a number) Belonging to the sequence generated by the formula $\frac{5n^2-3n}{2}$.

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
• Finnish: seitsenkulmainen
• 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): (Northern, Central) [əp.tə.ɣuˈnal]
• IPA^(key): (Balearic) [əp.tə.ɣoˈnal]
• IPA^(key): (Valencia, Northwestern) [ep.ta.ɣoˈnal]

Adjective

heptagonal m or f (masculine and feminine plural heptagonals)

1. heptagonal

French

Pronunciation

• ^{(mute h)} IPA^(key): /ɛp.ta.ɡɔ.nal/

• 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]

 

• (Portugal) IPA^(key): /ˌɛp.tɐ.ɡuˈnal/ [ˌɛp.tɐ.ɣuˈnaɫ]

• (Portugal) IPA^(key): /ˌɛp.tɐ.ɡuˈnal/ [ˌɛp.tɐ.ɣuˈnaɫ]
  • (Southern Portugal) IPA^(key): /ˌɛp.tɐ.ɡuˈna.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, 2008–2026
• “heptagonal”, in Dicionário Priberam da Língua Portuguesa (in Portuguese), Lisbon: Priberam, 2008–2026

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), 24th edition, Royal Spanish Academy [Spanish: Real Academia Española], 30 October 2026