Usage History of 'biradical'

The following chart shows how frequently 'biradical' appeared in printed materials over time. For example, the word 'biradical' occurred 4 times in books in 1845 and 627 times in 2008. From 1845 to 2008, the word 'biradical' was used a total of 26,344 times in books scanned by Google. See Reference: Google Ngram project.

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