Usage History of 'viroids'

The following chart shows how frequently 'viroids' appeared in printed materials over time. For example, the word 'viroids' occurred 2 times in books in 1932 and 1,530 times in 2008. From 1932 to 2008, the word 'viroids' was used a total of 54,767 times in books scanned by Google. See Reference: Google Ngram project.

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