quadruplex

1. not comparableHaving four components.
2. not comparableOf or relating to a system in telegraphy by which four messages (two in each direction) can be sent on one wire simultaneously.
3. not comparableOf or relating to an early videotape format with four magnetic record/reproduce heads mounted on a headwheel spinning transversely across the tape.

plural quadruplexes

1. countableA quadruplex system.

   1 more example

   The Western Union office is equipped with four quadruplexes, three duplexes and eleven single loops, besides special private loops in the Japanese and Russian suites, where direct communication will be maintained with the Atlantic cables at Heart’s Content, Newfoundland via Canso, and also with the Western Union offices in New York, whence the Japanese diplomatic matter will be sent via land lines to San Francisco over a direct circuit.

   1905 August 12, Electrical World and Engineer, volume XLVI, number 7, New York, N.Y., page 256, column 1

2. abbreviationclippinguncountableClipping of quadruplex videotape, an early type of videotape with four magnetic record/reproduce heads mounted on a headwheel spinning transversely across the tape.

present singular third person quadruplexes · participle present quadruplexing · participle past quadruplexed · past quadruplexed

1. transitiveTo make quadruplex.