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repressor

[ri-pres-er] /rɪˈprɛs ər/
noun
1.
2.
Genetics. a protein that binds DNA at an operator site and thereby prevents transcription of one or more adjacent genes.
Origin
1955-1960
1955-60; < Latin; see repress, -tor
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for re pressor

repressor

/rɪˈprɛsə/
noun
1.
(biochem) a protein synthesized under the control of a repressor gene, which has the capacity to bind to the operator gene and thereby shut off the expression of the structural genes of an operon
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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re pressor in Medicine

repressor re·pres·sor (rĭ-prěs'ər)
n.

  1. One that represses.

  2. A protein, especially either of two proteins produced by regulatory genes, that blocks transcription of an operon.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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re pressor in Science
repressor
  (rĭ-prěs'ər)   
A protein that binds to an operator, blocking transcription of an operon and the enzymes for which the operon codes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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