Definitions from Wiktionary (penicillin)

▸ noun:  (pharmacology) Any of a group of narrow-spectrum antibiotics obtained from Penicillium molds or synthesized, that have a beta-lactam structure and are active against gram-positive bacteria and used in the treatment of various infections and diseases.
▸ noun:  (mycology) A blue mold of the genus Penicillium that produces penicillin.
▸ Also see penicillin

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