quadruplex /kwodˈrə-pleks/

1. Fourfold
2. (of a Morse telegraphic system) capable of sending four messages at once, two each way, over one wire

1. An instrument of this kind
2. A videotape recording and reproduction system using four rotating heads to produce transverse tracks on magnetic tape

To make quadruplex

quadruˈplicate adjective

Fourfold

1. One of four corresponding things
2. Fourfoldness

To make fourfold

quadruplicāˈtion noun

quadruplicity /-plisˈi-ti/ noun

• cathisma
• cathismas
• cathodal
• cathode
• cathode-ray oscillograph
• cathode-ray oscillographs
• cathode rays
• cathode-ray tube
• cathode-ray tubes
• cathodes
• cathodic
• cathodic protection
• cathodograph
• cathodographer
• cathodographers
• cathodographies
• cathodographs
• cathodography
• cathodoluminescence
• cathole
• catholes
• catholic
• Catholic
• catholically
• Catholic and Apostolic Church