Usage History of 'bitterns'

The following chart shows how frequently 'bitterns' appeared in printed materials over time. For example, the word 'bitterns' occurred 4 times in books in 1645 and 2,487 times in 2008. From 1645 to 2008, the word 'bitterns' was used a total of 60,198 times in books scanned by Google. See Reference: Google Ngram project.

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