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Definition of quadruplex : Fourfold; folded or doubled twice.

Synonyms:

fourfold, quadruple, quadruplicate, multiple, four-fold

Usage examples:

• Herein lay the germ of the Edison quadruplex. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.
• The quadruplex has not as a rule the same working efficiency that four separate wires have. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.
• About this time I invented the quadruplex. - "Edison, His Life and Inventions", Frank Lewis Dyer and Thomas Commerford Martin.