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[sis-tron] /ˈsɪs trɒn/
noun, Genetics.
a segment of DNA that encodes for the formation of a specific polypeptide chain; a structural gene.
Origin of cistron
First recorded in 1955-60; cis- + tr(ans)- + -on1
Related forms
cistronic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for cistron


(genetics) the section of a chromosome that encodes a single polypeptide chain
Word Origin
C20: from cis-trans; see cis-trans test
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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cistron in Medicine

cistron cis·tron (sĭs'trŏn')
The smallest functional unit of heredity; a length of chromosomal DNA associated with a single biochemical function and essentially equivalent to a gene.

cis·tron'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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cistron in Science
A section of DNA that contains the genetic code for a single polypeptide and functions as a hereditary unit.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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