Usage History of 'hydrotropism'

The following chart shows how frequently 'hydrotropism' appeared in printed materials over time. For example, the word 'hydrotropism' occurred 22 times in books in 1882 and 497 times in 2008. From 1882 to 2008, the word 'hydrotropism' was used a total of 11,213 times in books scanned by Google. See Reference: Google Ngram project.

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