Quadruplex

Origin

From Latin quadruplex ("fourfold, quadruple"), from quattuor ("four") + plico ("fold")

Full definition of quadruplex

Adjective

1. Having four components.The child's toy was quadruplex and had four moving parts.
2. Of or relating to a system in telegraphy by which four messages (two in each direction) can be sent on one wire simultaneously.

Noun

1. A quadruplex system