magnoxPronunciation: /ˈmagnɒks/Definition of magnox noun [mass noun] a magnesium-based alloy used to enclose uranium fuel elements in some nuclear reactors. (Magnox) [as modifier] denoting the first widely used British design of nuclear power station, which used fuel clad with magnox. Origin: 1950s: from the phrase mag(nesium) n(o) ox(idation)
