Usage History of 'retroversion'

The following chart shows how frequently 'retroversion' appeared in printed materials over time. For example, the word 'retroversion' occurred 6 times in books in 1781 and 3,500 times in 2008. From 1781 to 2008, the word 'retroversion' was used a total of 119,863 times in books scanned by Google. See Reference: Google Ngram project.

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