Usage History of 'diapsid'

The following chart shows how frequently 'diapsid' appeared in printed materials over time. For example, the word 'diapsid' occurred 4 times in books in 1912 and 372 times in 2008. From 1912 to 2008, the word 'diapsid' was used a total of 9,238 times in books scanned by Google. See Reference: Google Ngram project.

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