Usage History of 'retroflection'

The following chart shows how frequently 'retroflection' appeared in printed materials over time. For example, the word 'retroflection' occurred 6 times in books in 1788 and 332 times in 2008. From 1788 to 2008, the word 'retroflection' was used a total of 14,888 times in books scanned by Google. See Reference: Google Ngram project.

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