Usage History of 'hypethral'

The following chart shows how frequently 'hypethral' appeared in printed materials over time. For example, the word 'hypethral' occurred 6 times in books in 1806 and 22 times in 2008. From 1806 to 2008, the word 'hypethral' was used a total of 703 times in books scanned by Google. See Reference: Google Ngram project.

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