Dictionary![]() ![]() pen•i•cil•la•minePronunciation: (pen"u-sil'u-mēn", -min), [key] —n. Pharm. a chelating agent, C5H11NO2S, produced by the degradation of penicillin, used in the treatment of severe rheumatoid arthritis and in heavy metal poisoning. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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