exon

noun
ex·on | \ˈek-ˌsän \

Definition of exon 

: a polynucleotide sequence in a nucleic acid that codes information for protein synthesis and that is copied and spliced together with other such sequences to form messenger RNA — compare intron

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Other Words from exon

exonic \ek-ˈsä-nik \ adjective

Examples of exon in a Sentence

Recent Examples on the Web

In one case, at Stanford, a toddler was diagnosed with two rare diseases, including a connective tissue disorder called Marfan Syndrome, after doctors conducted a form of sequencing that looks for changes in coded genetic segments known as exons. Anna Gorman, CNN, "Doctors battle 'torment' of rare undiagnosed illnesses," 8 May 2017 Named for parts of genes called introns and exons, Intrexon was founded in 1998 by Thomas D. Reed and his wife, Jackie, to supply DNA constructs for research with genetically engineered mice. Andrew Pollack, New York Times, "A Biotech Evangelist Seeks a Zika Dividend," 5 Mar. 2016

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'exon.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of exon

circa 1978, in the meaning defined above

History and Etymology for exon

expressed sequence + -on entry 2

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Time Traveler for exon

The first known use of exon was circa 1978

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More Definitions for exon

exon

noun
ex·on | \ˈek-ˌsän \

Medical Definition of exon 

: a polynucleotide sequence in a nucleic acid that codes information for protein synthesis and that is copied and spliced together with other such sequences to form messenger RNA — compare intron

Other Words from exon

exonic \ek-ˈsän-ik \ adjective

More from Merriam-Webster on exon

See words that rhyme with exon

Britannica.com: Encyclopedia article about exon

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