Usage History of 'pericardium'

The following chart shows how frequently 'pericardium' appeared in printed materials over time. For example, the word 'pericardium' occurred 6 times in books in 1679 and 19,663 times in 2008. From 1679 to 2008, the word 'pericardium' was used a total of 815,046 times in books scanned by Google. See Reference: Google Ngram project.

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