Dictionary  mo•nen•sinPronunciation: (mō-nen'sin), [key] —n. Biochem. a complex derivative of butyric acid, C36H62O11, produced by the bacterium Streptomyces cinnamonensis and used as an antibiotic in animals. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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