follow Dictionary.com

Why turkey has the same name as Turkey

exon1

[ek-son] /ˈɛk sɒn/
noun
1.
(in Britain) one of four yeomen of the guard who act as commanding officers in the absence of higher authority.
Also called exempt.
Origin
1645-1655
1645-55; earlier exant, for French exempt (spelling altered to show French pronunciation)

exon2

[ek-son] /ˈɛk sɒn/
noun, Genetics.
1.
any portion of an interrupted gene that is represented in the RNA product and is translated into protein.
Compare intron.
Origin
1975-80; ex(pressed sequence) + -on1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source
British Dictionary definitions for exons

exon1

/ˈɛksɒn/
noun
1.
(Brit) one of the four officers who command the Yeomen of the Guard
Word Origin
C17: a pronunciation spelling of French exemptexempt

exon2

/ˈɛksɒn/
noun
1.
any segment of a discontinuous gene the segments of which are separated by introns Compare intron
Derived Forms
exonic, adjective
Word Origin
C20: from ex-1 + -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
Cite This Source
exons in Medicine

exon ex·on (ěk'sŏn)
n.
A nucleotide sequence in DNA that carries the code for the final mRNA molecule and thus defines a protein's amino acid sequence. Also called coding sequence.


ex·on'ic adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
exons in Science
exon
  (ěk'sŏn)   
A segment of a gene that contains information used in coding for protein synthesis. Genetic information within genes is discontinuous, split among the exons that encode for messenger RNA and absent from the DNA sequences in between, which are called introns. Genetic splicing, catalyzed by enzymes, results in the final version of messenger RNA, which contains only genetic information from the exons. Compare intron.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Cite This Source
exons in Culture

exon definition


Stretches of DNA in genes that code for proteins. In eukaryotes, exons in a given gene are generally separated from each other by stretches of DNA that do not contain instructions for constructing proteins. (Compare intron.)

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

Word of the Day

Difficulty index for exon

Many English speakers likely know this word

Word Value for exons

0
13
Scrabble Words With Friends

Nearby words for exons