Usage History of 'heptagonal'

The following chart shows how frequently 'heptagonal' appeared in printed materials over time. For example, the word 'heptagonal' occurred 2 times in books in 1741 and 574 times in 2008. From 1741 to 2008, the word 'heptagonal' was used a total of 10,854 times in books scanned by Google. See Reference: Google Ngram project.

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