Word Meanings - SEPTANGULAR - Book Publishers vocabulary database

Heptagonal.

Related words: (words related to SEPTANGULAR)

• HEPTAGONAL
  Having seven angles or sides. Heptagonal numbers , 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.