Usage History of 'retardant'

The following chart shows how frequently 'retardant' appeared in printed materials over time. For example, the word 'retardant' occurred 1 time in books in 1709 and 6,032 times in 2008. From 1709 to 2008, the word 'retardant' was used a total of 240,268 times in books scanned by Google. See Reference: Google Ngram project.

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