operon

[op-uh-ron] /ˈɒp əˌrɒn/
noun, Genetics.
1.
a set of two or more adjacent cistrons whose transcription is under the coordinated control of a promoter, an operator, and a regulator gene.
Origin
1960-65; < French opéron, equivalent to opér(er) to work, operate + -on -on1
British Dictionary definitions for operon

operon

/ˈɒpəˌrɒn/
noun
1.
(genetics) a group of adjacent genes in bacteria functioning as a unit, consisting of structural genes and an operator
Word Origin
C20: from operate
operon in Medicine

operon op·er·on (ŏp'ə-rŏn')
n.
A unit of gene activity consisting of a sequence of genetic material that functions in a coordinated manner to control the production of mRNA and that consists of an operator gene, a promoter, and two or more structural genes.

operon in Science
operon
  (ŏp'ə-rŏn')   
A sequence of genetic material that functions in a coordinated manner, consisting of an operator, a promoter, and one or more structural genes that are transcribed together. Operons were first found in prokaryotes.