Usage History of 'rugae'

The following chart shows how frequently 'rugae' appeared in printed materials over time. For example, the word 'rugae' occurred 2 times in books in 1750 and 1,444 times in 2008. From 1750 to 2008, the word 'rugae' was used a total of 93,457 times in books scanned by Google. See Reference: Google Ngram project.

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