repressor

noun

re·​pres·​sor ri-ˈpre-sər How to pronounce repressor (audio)
: one that represses
especially : a protein that is determined by a regulatory gene, binds to a genetic operator, and inhibits the initiation of transcription of messenger RNA

Example Sentences

Recent Examples on the Web In their construction, the first gene produced a repressor protein, LacI, which would shut off the second gene, called tetR, whose product would shut off the third gene, cI, whose product would shut off the first gene. Adam Mann, Discover Magazine, 25 Mar. 2020 Once all the cells in the plant have turned off their repressor gene, buds begin to form, usually just in time for the spring heat to spur new growth. Jonathan Kauffman, Bon Appétit, 13 Apr. 2022 Netanyahu is on trial for corruption and heads a state that is widely seen as a repressor of Palestinian rights. Tracy Wilkinson Staff Writer, Los Angeles Times, 26 May 2021 The researchers enhanced this silencing effect by hitching Cas9 to a repressor, another protein that inhibits gene expression. Kelly Servick, Science | AAAS, 10 Mar. 2021 But no one had identified a full activator-repressor system involved in periodic pigmentation patterns. Elizabeth Pennisi, Science | AAAS, 29 Aug. 2019 The cycle at the center of it—from gene activators to repressors and back—is highly regulated. John Timmer, Ars Technica, 2 Oct. 2017 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'repressor.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Word History

Etymology

New Latin

First Known Use

1584, in the meaning defined above

Time Traveler
The first known use of repressor was in 1584

Dictionary Entries Near repressor

Cite this Entry

“Repressor.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/repressor. Accessed 26 Jan. 2023.

Kids Definition

repressor

noun
re·​pres·​sor ri-ˈpres-ər How to pronounce repressor (audio)
: one that represses
especially : a protein that keeps a special region of a chromosome from acting to start the manufacture of messenger RNA

Medical Definition

repressor

noun
re·​pres·​sor ri-ˈpres-ər How to pronounce repressor (audio)
: one that represses
especially : a protein that is determined by a regulatory gene, binds to a genetic operator, and inhibits the initiation of transcription of messenger RNA

More from Merriam-Webster on repressor

Last Updated: - Updated example sentences
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!


The Great British Vocabulary Quiz

  • union jack speech bubble
  • Named after Sir Robert Peel, what are British police called?
Spell It

Hear a word and type it out. How many can you get right?

TAKE THE QUIZ
Solve today's spelling word game by finding as many words as you can with using just 7 letters. Longer words score more points.

Can you make 12 words with 7 letters?

PLAY