Usage History of 'hypnology'

The following chart shows how frequently 'hypnology' appeared in printed materials over time. For example, the word 'hypnology' occurred 4 times in books in 1842 and 50 times in 2008. From 1842 to 2008, the word 'hypnology' was used a total of 1,092 times in books scanned by Google. See Reference: Google Ngram project.

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