Usage History of 'tubercles'

The following chart shows how frequently 'tubercles' appeared in printed materials over time. For example, the word 'tubercles' occurred 6 times in books in 1682 and 18,792 times in 2008. From 1682 to 2008, the word 'tubercles' was used a total of 1,131,793 times in books scanned by Google. See Reference: Google Ngram project.

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