Quadruplex
Part of speech: noun
Definition: A quadruplex system
Part of speech: adjective
Definition: Having four components. of or relating to a system in telegraphy by which four messages can be sent on one wire simultaneously.
Quadruple
Part of speech: adjective
Definition: Being four times as long, as big or as many of something.
Part of speech: verb
Definition: To multiply something by four times.