terminator

in biotechnology
https://doi.org/10.1351/goldbook.T06275
A sequence of DNA lying beyond the 3' end of the coding segment of a gene which is recognized by RNA polymerase as a signal to stop synthesizing mRNA.
Source:
PAC, 1992, 64, 143. (Glossary for chemists of terms used in biotechnology (IUPAC Recommendations 1992)) on page 166 [Terms] [Paper]