Usage History of 'pantropical'

The following chart shows how frequently 'pantropical' appeared in printed materials over time. For example, the word 'pantropical' occurred 4 times in books in 1810 and 694 times in 2008. From 1810 to 2008, the word 'pantropical' was used a total of 20,260 times in books scanned by Google. See Reference: Google Ngram project.

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