noun Genetics.
a segment of DNA that encodes for the formation of a specific polypeptide chain; a structural gene.

1955–60; cis- + tr(ans)- + -on1

cistronic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cistron (ˈsɪstrən)
genetics the section of a chromosome that encodes a single polypeptide chain
[C20: from cis-trans; see cis-trans test]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
cistron   (sĭs'trŏn')  Pronunciation Key 
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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