quadruplex Hear it!

quadruplex definition

quad·ru·plex (kwä′drə pleks′, -dro̵̅o̅-)

adjective

  1. fourfold
  2. ☆ designating or of a former system of telegraphy in which four messages could be sent simultaneously over one wire, two in either direction

Etymology: L < quadru- (see quadruped) + -plex, -fold: see duplex

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