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intron

[in-tron] /ˈɪn trɒn/
noun, Genetics.
1.
a noncoding segment in a length of DNA that interrupts a gene-coding sequence or nontranslated sequence, the corresponding segment being removed from the RNA copy before transcription.
Also called intervening sequence.
Compare exon2 .
Origin
1975-1980
1975-80; perhaps intr(o)- + -on1
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for introns

intron

/ˈɪntrɒn/
noun
1.
(biochem) a stretch of DNA that interrupts a gene and does not contribute to the specification of a protein Compare exon2
Word Origin
C20: from intr(agenic) (regi)on
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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Word Origin and History for introns

intron

1978, from intragenic + -on.

Online Etymology Dictionary, © 2010 Douglas Harper
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introns in Medicine

intron in·tron (ĭn'trŏn)
n.
A segment of a gene situated between exons that does not function in coding for protein synthesis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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introns in Science
intron
  (ĭn'trŏn)   
A segment of a gene situated between exons that does not function in coding for protein synthesis. After transcription of a gene to messenger RNA, the transcriptions of introns are removed, and the exons are spliced together by enzymes before translation and assembly of amino acids into proteins. Compare exon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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introns in Culture

intron definition


A stretch of DNA in a gene that does not code for proteins. In eukaryotes, introns in a given gene separate stretches of DNA that contain instructions for constructing proteins. (Compare exon.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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