nichromePronunciation: /ˈnʌɪkrəʊm/Definition of nichrome noun [mass noun] trademark an alloy of nickel with chromium (10 to 20 per cent) and sometimes iron (up to 25 per cent), used chiefly in high-temperature applications such as electrical heating elements: [as modifier]:Nichrome wireOrigin: early 20th century: blend of nickel and chromenichrome in other Oxford dictionaries Definition of nichrome in the US English dictionary