exon

from WordNet (r) 3.0 (2006)

exon
    n 1: sequence of a gene's DNA that transcribes into protein
         structures; "exons are interspersed with introns" [syn:
         {exon}, {coding DNA}] [ant: {intron}, {noncoding DNA}]

from The Collaborative International Dictionary of English v.0.48

Exon \Ex"on\, n. [NL., from E. Exe (Celt. uisge water) the name
   of a river.]
   A native or inhabitant of Exeter, in England.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Exon \Ex"on\, n. [F. expect an under officer.]
   An officer of the Yeomen of the Guard; an Exempt. [Eng.]
   [1913 Webster]

from Jargon File (4.4.4, 14 Aug 2003)

Exon
 /eks'on/, excl.

   A generic obscenity that quickly entered wide use on the Internet and
   Usenet after the passage of the Communications Decency Act. From the
   last name of Senator James Exon (Democrat-Nebraska), primary author of
   the {CDA}. This usage outlasted the CDA itself, which was quashed a
   little over a year later by one of the most acerbic pro-free-speech
   opinions ever uttered by the Supreme Court. The campaign against it
   was led by an alliance of hackers and civil libertarians, and was the
   first effective political mobilization of the hacker culture. Use of
   Exon's name as an expletive outlived the CDA controversy itself.