Usage History of 'strengthener'

The following chart shows how frequently 'strengthener' appeared in printed materials over time. For example, the word 'strengthener' occurred 2 times in books in 1664 and 1,592 times in 2008. From 1664 to 2008, the word 'strengthener' was used a total of 35,401 times in books scanned by Google. See Reference: Google Ngram project.

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