Usage History of 'rugous'

The following chart shows how frequently 'rugous' appeared in printed materials over time. For example, the word 'rugous' occurred 2 times in books in 1702 and 127 times in 2008. From 1702 to 2008, the word 'rugous' was used a total of 9,816 times in books scanned by Google. See Reference: Google Ngram project.

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