Usage History of 'placentas'

The following chart shows how frequently 'placentas' appeared in printed materials over time. For example, the word 'placentas' occurred 2 times in books in 1707 and 3,457 times in 2008. From 1707 to 2008, the word 'placentas' was used a total of 134,036 times in books scanned by Google. See Reference: Google Ngram project.

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