Usage History of 'piliform'

The following chart shows how frequently 'piliform' appeared in printed materials over time. For example, the word 'piliform' occurred 1 time in books in 1813 and 14 times in 2008. From 1813 to 2008, the word 'piliform' was used a total of 1,531 times in books scanned by Google. See Reference: Google Ngram project.

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