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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Any of a group of broad-spectrum antibiotic drugs obtained from penicillium molds or produced synthetically, most active against gram-positive bacteria and used in the treatment of various infections and diseases.

Wiktionary

  1. n. pharmacology Any of a group of broad-spectrum antibiotics obtained from Penicillium molds or synthesized; they have a beta-lactam structure; most are active against gram-positive bacteria and used in the treatment of various infections and diseases.

GNU Webster's 1913

  1. n. (Chem.) Any of a variety of substances having a structure containing a beta-lactam ring fused to a thiirane ring, to which a carboxyl group is attached, but most commonly interpreted as benzyl penicillin. They are notable as powerful antibacterial agents of relatively low toxicity which have found extensive use in medicine for treating bacterial infections. They are categorized as one of the classes of beta-lactam antibiotic. They are produced naturally by some fungi and bacteria, and industrial production processes almost invariably start from some form of penicillin nucleus produced by fermentation of microorganisms. The fermentation products are then chemically modified to produce derivatives of enhanced potency, safety, or antibacterial spectrum. The first penicillin to see extensive use clinically (during World War II) was penicillin G, also called benzypenicillin, and commonly simply “penicillin”.

WordNet 3.0

  1. n. any of various antibiotics obtained from Penicillium molds (or produced synthetically) and used in the treatment of various infections and diseases

Etymologies

  1. Coined by Alexander Fleming after New Latin Penicillium notatum (now Penicillium chrysogenum), a fungus from which penicillin is obtained. (Wiktionary)
  2. penicill(ium) + -in. (American Heritage® Dictionary of the English Language, Fourth Edition)

Examples

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Lists

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Comments

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  • jwjarvis 1928 Alexander Fleming, from random mold that flew in dish. Later cultured from green mold on grapefruit. not discovered from a lead compound, it is the lead compound. Jan 20, 2011

  • fbharjo paintbrush or brushedpaint etymologically Mar 6, 2009

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‘penicillin’ has been looked up 1532 times, added to 10 lists, commented on 2 times, and has a Scrabble score of 14.