Usage History of 'plastron'

The following chart shows how frequently 'plastron' appeared in printed materials over time. For example, the word 'plastron' occurred 2 times in books in 1671 and 3,367 times in 2008. From 1671 to 2008, the word 'plastron' was used a total of 106,862 times in books scanned by Google. See Reference: Google Ngram project.

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