Usage History of 'opercule'

The following chart shows how frequently 'opercule' appeared in printed materials over time. For example, the word 'opercule' occurred 5 times in books in 1778 and 32 times in 2008. From 1778 to 2008, the word 'opercule' was used a total of 2,380 times in books scanned by Google. See Reference: Google Ngram project.

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