Usage History of 'keratoid'

The following chart shows how frequently 'keratoid' appeared in printed materials over time. For example, the word 'keratoid' occurred 3 times in books in 1872 and 2 times in 2007. From 1872 to 2007, the word 'keratoid' was used a total of 1,561 times in books scanned by Google. See Reference: Google Ngram project.

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