Usage History of 'involucre'

The following chart shows how frequently 'involucre' appeared in printed materials over time. For example, the word 'involucre' occurred 2 times in books in 1756 and 2,190 times in 2008. From 1756 to 2008, the word 'involucre' was used a total of 99,087 times in books scanned by Google. See Reference: Google Ngram project.

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