Usage History of 'electrotonic'

The following chart shows how frequently 'electrotonic' appeared in printed materials over time. For example, the word 'electrotonic' occurred 4 times in books in 1837 and 815 times in 2008. From 1837 to 2008, the word 'electrotonic' was used a total of 87,979 times in books scanned by Google. See Reference: Google Ngram project.

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