quadruplex

Adjective

quad=ru=plex

CIDE DICTIONARY

quadruplex, a. [L., from quattuor four + plicare to fold.].

Fourfold; folded or doubled twice. [1913 Webster]

Quadruplex system (Electric Telegraph), a system by which four messages, two in each direction, may be sent simultaneously over the wire.

For further exploring for "quadruplex" in Webster Dictionary Online

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