Exon

[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.
[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.
/ˈɛksɒn/
noun
1.
(Brit) one of the four officers who command the Yeomen of the Guard
/ˈɛksɒn/
noun
1.
any segment of a discontinuous gene the segments of which are separated by introns Compare intron

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.
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.

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.)