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Webster 1913 Edition

Heptagonal

Hep-tag′o-nal

,
Adj.
[Cf. F.
heptagonal
.]
Having seven angles or sides.
Heptagonal numbers
(Arith.)
,
the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.

Webster 1828 Edition

Heptagonal

HEPTAG'ONAL

,
Adj.
Having seven angles or sides. Heptagonal numbers, in arithmetic, a sort of polygonal numbers, wherein the difference of the terms of the corresponding arithmetical progression is 5. One of the properties of these numbers is, that if they are multiplied by 40, and 9 is added to the product, the sum will be a square number.

Definition 2024

heptagonal

heptagonal

English

Adjective

heptagonal ‎(not comparable)

  1. Having seven angles and sides.
  2. (mathematics, of a number) Belonging to the sequence generated by the formula .

Related terms

Translations

Anagrams

Asturian

Adjective

heptagonal (epicene, plural heptagonales)

  1. heptagonal (having seven angles and sides)

Synonyms

Catalan

Etymology

heptàgon +‎ -al

Adjective

heptagonal m, f ‎(masculine and feminine plural heptagonals)

  1. heptagonal

Portuguese

Adjective

heptagonal m, f ‎(plural heptagonais, comparable)

  1. heptagonal (having seven angles and sides)

Synonyms

Spanish

Adjective

heptagonal m, f ‎(plural heptagonales)

  1. heptagonal

Synonyms

Etymology

Since 16th century, from heptagon +‎ -al, from Ancient Greek έπτάγωνος ‎(éptágōnos).

Pronunciation

  • IPA(key): /hɛpˈtæg ə nl/

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