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adj. Having four components.

adj. of or relating to a system in telegraphy by which four messages can be sent on one wire simultaneously.

n. A quadruplex system

adj. Fourfold; folded or doubled twice.

Fourfold: applied to a system of telegraphy in which four messages may be transmitted simultaneously over one wire.

n. An instrument by means of which four messages may be transmitted simultaneously over one wire.

n. Sometimes abbreviated quad.

To make quadruplex; arrange for fourfold transmission.

adj. having four units or components

"The quadruplex was the tempting goal toward which Edison now constantly turned, and after more than a year's strenuous work he filed a number of applications for patents in the late summer of 1874."

multiple   

fourfold   

irm    contulit    bifold    patribus    tercio    lectric    mwyn    if    intuitional    frist