quadruplex

from WordNet (r) 3.0 (2006)

quadruplex
    adj 1: having four units or components; "quadruple rhythm has
           four beats per measure"; "quadruplex wire" [syn:
           {quadruple}, {quadruplicate}, {quadruplex}, {fourfold},
           {four-fold}]

from The Collaborative International Dictionary of English v.0.48

Quadruplex \Quad"ru*plex\, a. [L., from quattuor four + plicare
   to fold.]
   Fourfold; folded or doubled twice.
   [1913 Webster]

   {Quadruplex system} (Electric Telegraph), a system by which
      four messages, two in each direction, may be sent
      simultaneously over the wire.
      [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

quadruplex

   <communications> A kind of telegraphy system developed by
   Thomas A. Edison in the 1870s combining {diplex} and {duplex}
   communications to support simultaneous transmission of two
   messages in each direction.

   (2000-04-02)

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