Usage History of 'frustule'

The following chart shows how frequently 'frustule' appeared in printed materials over time. For example, the word 'frustule' occurred 2 times in books in 1817 and 722 times in 2008. From 1817 to 2008, the word 'frustule' was used a total of 25,939 times in books scanned by Google. See Reference: Google Ngram project.

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