Usage History of 'sphenic'

The following chart shows how frequently 'sphenic' appeared in printed materials over time. For example, the word 'sphenic' occurred 4 times in books in 1831 and 7 times in 2006. From 1831 to 2006, the word 'sphenic' was used a total of 141 times in books scanned by Google. See Reference: Google Ngram project.

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