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quadruplex (adj.)

1875, in reference to telegraph systems in which four messages can be wired simultaneously, from quadru- + -plex. In classical Latin, quadruplex meant "fourfold, quadruple," as a noun, "a fourfold amount." Related: Quadruplicity "fourfold nature," 1580s, from Latin quadruplicitas, noun of quality from quadruplex.

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Definitions of quadruplex from WordNet

quadruplex (adj.)
having four units or components;
quadruplex wire
Synonyms: quadruple / quadruplicate / fourfold / four-fold
From wordnet.princeton.edu