Definition

Noun 1. A type of penicillin antibiotic: Penicillin O is a specific antibiotic compound belonging to the penicillin class. It is chemically and therapeutically similar to Penicillin G (benzylpenicillin) in its antibacterial action but is produced or obtained through a different method or source.

Usage Notes

• Penicillin O is a technical, scientific term used primarily in medical, pharmaceutical, and historical contexts.
• It refers to a specific chemical entity within the broader penicillin family, distinguished by its production process.

Examples

• Noun:
  • Early clinical trials compared the efficacy of penicillin O to that of penicillin G.
  • The production method for penicillin O differed from the fermentation process used for other early penicillins.
  • This historical paper discusses the isolation and properties of penicillin O.

Advanced Usage

• The term is almost exclusively used in technical writing. In general medical practice today, more common penicillin derivatives are prescribed, making "penicillin O" a term encountered mainly in historical or specialized literature.

Variants and Related Words

• Penicillin (n): The broader class of antibiotic drugs derived from Penicillium fungi or produced synthetically.
• Penicillin G (n, Benzylpenicillin): The first widely used and most common natural penicillin, often used for comparison with penicillin O.
• Antibiotic (n): A substance that inhibits the growth of or destroys microorganisms.

Synonyms

• Allylmercaptomethylpenicillin (chemical name)
• Almecillin (alternative name)

Notes on Meaning

• The core meaning specifies a specific compound within a well-known drug class, defined by its similar action but different origin/production compared to a standard reference (Penicillin G). It does not refer to the general concept of penicillin.

Noun

1. a penicillin that is similar in antibiotic action to penicillin G but is obtained differently