Monobactam

Part of speech: noun

Definitions

1. An antibiotic drug containing a single beta-lactam ring that inhibits bacterial cell wall synthesis and is used to treat infections
2. A class of beta-lactam antibiotic characterized by a monocyclic structure rather than the bicyclic rings found in penicillins and cephalosporins
3. An antibiotic agent with a lone beta-lactam ring that disrupts bacterial growth by weakening the cell wall, effective against certain gram-negative bacteria

Etymology: Monobactams are a class of antibiotics, and their name is a compound built from two parts, each with its own history. The "mono-" comes from Ancient Greek "mónos," meaning "single" or "alone," a root that reached English as a prefix used in countless scientific coinages. The "beta-lactam" half is older and stranger. "Beta" traces back to the Phoenician letter "bt," which the Greeks adopted as "bêta," and "lacto-" comes from Latin "lac," meaning "milk." Chemists combined these with "-one" and "-am(ide)" to form "lactam," a ring-shaped molecule, and the "beta" marks the position of a particular carbon atom within that ring. Monobactams therefore bear the name of a single-ring structure, which distinguishes them from the beta-lactam antibiotics, most of which have a second ring fused to the first. The term is a modern technical coinage, formed by joining "mono-" to "beta-lactam," and it reflects the chemistry rather than any historical usage. Its component parts, however, carry the traces of Greek, Phoenician, Latin, and Egyptian names that the chemical vocabulary absorbed over centuries.

Synonyms: antibiotic