Usage History of 'opacifies'

The following chart shows how frequently 'opacifies' appeared in printed materials over time. For example, the word 'opacifies' occurred 2 times in books in 1850 and 109 times in 2008. From 1850 to 2008, the word 'opacifies' was used a total of 7,197 times in books scanned by Google. See Reference: Google Ngram project.

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