Usage History of 'heptad'

The following chart shows how frequently 'heptad' appeared in printed materials over time. For example, the word 'heptad' occurred 8 times in books in 1791 and 1,370 times in 2008. From 1791 to 2008, the word 'heptad' was used a total of 20,812 times in books scanned by Google. See Reference: Google Ngram project.

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