Usage History of 'pterygia'

The following chart shows how frequently 'pterygia' appeared in printed materials over time. For example, the word 'pterygia' occurred 6 times in books in 1741 and 298 times in 2008. From 1741 to 2008, the word 'pterygia' was used a total of 13,472 times in books scanned by Google. See Reference: Google Ngram project.

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