quadruplex

adjective
quad·ru·plex | \ ˈkwädrəˌpleks \

Definition of quadruplex 

: being or relating to a system of telegraphy by which two messages in each direction may be sent simultaneously over one wire

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History and Etymology for quadruplex

Latin quadruplic-, quadruplex fourfold, from quadri- + -plic-, -plex -fold

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