op|er|on

op|er|on «OP uhr on», noun.

the region of a chromosome which contains the operator gene and any structural genes involved in the production of messenger RNA for a given synthesis: »

An operon is a chromosomal unit consisting of a group of adjacent structural genes,…and the operator, which coordinates their activities (Clifford R. Noll, Jr.).

╂[< oper(ator) + -on]