Usage History of 'pyrethrum'

The following chart shows how frequently 'pyrethrum' appeared in printed materials over time. For example, the word 'pyrethrum' occurred 2 times in books in 1724 and 3,525 times in 2008. From 1724 to 2008, the word 'pyrethrum' was used a total of 234,076 times in books scanned by Google. See Reference: Google Ngram project.

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