Usage History of 'tricyclics'

The following chart shows how frequently 'tricyclics' appeared in printed materials over time. For example, the word 'tricyclics' occurred 2 times in books in 1885 and 3,377 times in 2008. From 1885 to 2008, the word 'tricyclics' was used a total of 119,094 times in books scanned by Google. See Reference: Google Ngram project.

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