Since 16th century, from heptagon +‎ -al.

• IPA^(key): /hɛpˈtæɡənəl/

• Audio (Canada):

  (file)

• Rhymes: -æɡənəl

heptagonal (not comparable)

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

• septagonal

• heptagon
• septangle
• septangular

• paleognath

heptagonal (epicene, plural heptagonales)

1. heptagonal (having seven angles and sides)

• heptágonu

From heptàgon +‎ -al.

• IPA^(key): (Central)
• IPA^(key): (Balearic)
• IPA^(key): (Valencia)

heptagonal m or f (masculine and feminine plural heptagonals)

1. heptagonal

• Audio:

  (file)

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

1. heptagonal

• “heptagonal”, in Trésor de la langue française informatisé , 2012.

• Hyphenation: hep‧ta‧go‧nal

heptagonal m or f (plural heptagonais)

1. heptagonal (having seven angles and sides)

   Synonym: heptágono

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

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

1. heptagonal

• IPA^(key): /ebtaɡoˈnal/
• Rhymes: -al
• Syllabification: hep‧ta‧go‧nal

heptagonal m or f (masculine and feminine plural heptagonales)

1. heptagonal

   Synonym: heptágono

• “heptagonal”, in Diccionario de la lengua española (in Spanish), online version 23.8, Royal Spanish Academy , 10 December 2024