Cycline

Part of speech: noun

Definitions

1. Any of a group of broad-spectrum antibiotics derived from Streptomyces bacteria, characterized by a four-ring structure and used to treat various bacterial infections
2. A member of a family of antibiotics with a tetracyclic molecular structure, commonly used in medicine to combat infections caused by bacteria and some other microorganisms
3. An antibiotic compound featuring four fused rings in its chemical structure, prescribed to treat infections ranging from acne to respiratory diseases

Etymology: "Cycline" is not a word people use alone. It is a stem shared by a family of antibiotic drugs, including tetracycline, doxycycline, and minocycline, and it marks a shared chemical skeleton. The name builds on "cyclo-," from Greek "kyklos," meaning "circle" or "ring," because these molecules are built around a set of fused ring structures. The full name "tetracycline" adds "tetra-," Greek for "four," referring to the four rings in the core structure, and the chemical ending "-ine." The stem was then reused for related drugs with the same four-ring core, so "-cycline" works like a family name, much as "-cillin" does for penicillin-type antibiotics.