Usage History of 'heliotropism'

The following chart shows how frequently 'heliotropism' appeared in printed materials over time. For example, the word 'heliotropism' occurred 2 times in books in 1867 and 2,098 times in 2008. From 1867 to 2008, the word 'heliotropism' was used a total of 36,385 times in books scanned by Google. See Reference: Google Ngram project.

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