Usage History of 'biform'

The following chart shows how frequently 'biform' appeared in printed materials over time. For example, the word 'biform' occurred 6 times in books in 1720 and 138 times in 2008. From 1720 to 2008, the word 'biform' was used a total of 4,942 times in books scanned by Google. See Reference: Google Ngram project.

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