Usage History of 'gumma'

The following chart shows how frequently 'gumma' appeared in printed materials over time. For example, the word 'gumma' occurred 2 times in books in 1746 and 2,393 times in 2008. From 1746 to 2008, the word 'gumma' was used a total of 159,713 times in books scanned by Google. See Reference: Google Ngram project.

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