Usage History of 'trichromats'

The following chart shows how frequently 'trichromats' appeared in printed materials over time. For example, the word 'trichromats' occurred 6 times in books in 1889 and 202 times in 2008. From 1889 to 2008, the word 'trichromats' was used a total of 12,745 times in books scanned by Google. See Reference: Google Ngram project.

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