Usage History of 'oestrus'

The following chart shows how frequently 'oestrus' appeared in printed materials over time. For example, the word 'oestrus' occurred 2 times in books in 1726 and 3,969 times in 2008. From 1726 to 2008, the word 'oestrus' was used a total of 201,821 times in books scanned by Google. See Reference: Google Ngram project.

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