Usage History of 'triform'

The following chart shows how frequently 'triform' appeared in printed materials over time. For example, the word 'triform' occurred 3 times in books in 1697 and 276 times in 2008. From 1697 to 2008, the word 'triform' was used a total of 8,029 times in books scanned by Google. See Reference: Google Ngram project.

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