Usage History of 'thickened'

The following chart shows how frequently 'thickened' appeared in printed materials over time. For example, the word 'thickened' occurred 2 times in books in 1620 and 76,921 times in 2008. From 1620 to 2008, the word 'thickened' was used a total of 2,780,835 times in books scanned by Google. See Reference: Google Ngram project.

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