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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
Ellipsis of Bacterium coli or Bacillus coli, obsolete taxonomic names of the species (now called Escherichia coli). The word itself derives from Latin colī, genitive of colon (“colon, large intestine”).
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Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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