octuplex
/ˈɒktjʊplɛks/ /ˈɒktʃʊplɛks/Telegraphy rare. Now historical
adjective
Designating a system of electric telegraphy in which eight simultaneous messages can be sent along the same wire.
Origin
Late 19th century; earliest use found in The Review of Reviews. From octu- + -plex. Compare post-classical Latin octuplex eight-fold.