Usage History of 'protectoral'

The following chart shows how frequently 'protectoral' appeared in printed materials over time. For example, the word 'protectoral' occurred 4 times in books in 1665 and 566 times in 2008. From 1665 to 2008, the word 'protectoral' was used a total of 12,505 times in books scanned by Google. See Reference: Google Ngram project.

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