Usage History of 'naphthous'

The following chart shows how frequently 'naphthous' appeared in printed materials over time. For example, the word 'naphthous' occurred 8 times in books in 1834 and 2 times in 1995. From 1834 to 1995, the word 'naphthous' was used a total of 91 times in books scanned by Google. See Reference: Google Ngram project.

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