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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From international scientific vocabulary, and clearly reflecting New Latin, from Latin bīlis (“bile”). By surface analysis, bili- + -in, although according to American Heritage Dictionary, bilin was back-formed from phycobilin (as opposed to phycobilin being derived from bilin as surface analysis suggests).
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Classic usage
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