- In bacteria, a group of metabolically related genes, with a common promoter, whose transcription into a single polycistronic messenger RNA is under the control of an operator region.
Definition from: MeSH via Unified Medical Language System at the National Library of Medicine
- A group of closely linked genes that produces a single messenger RNA molecule in transcription and that consists of structural genes and regulating elements (as an operator and promoter).
Definition from: Merriam-Webster's Medical Dictionary by Merriam-Webster Inc.
See also Understanding Medical Terminology.