One of the mysteries of the English language finally explained.
An antibiotic preparation, originally thought to be an enzyme, obtained from cultures of the bacterium Pseudomonas aeruginosa and formerly used to treat diphtheria and other infections.
Early 20th century; earliest use found in Journal of the Chemical Society. From German Pyocyanase from pyocyan- (in scientific Latin pyocyaneus, former specific epithet of the source bacterium; from pyo- + classical Latin cyaneus, after pyocyanine or its etymon French pyocyanine) + German -ase.
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