Usage History of 'luteal'

The following chart shows how frequently 'luteal' appeared in printed materials over time. For example, the word 'luteal' occurred 2 times in books in 1802 and 10,221 times in 2008. From 1802 to 2008, the word 'luteal' was used a total of 385,657 times in books scanned by Google. See Reference: Google Ngram project.

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