Usage History of 'ortho'

The following chart shows how frequently 'ortho' appeared in printed materials over time. For example, the word 'ortho' occurred 2 times in books in 1620 and 19,146 times in 2008. From 1620 to 2008, the word 'ortho' was used a total of 733,166 times in books scanned by Google. See Reference: Google Ngram project.

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