ternePronunciation: /təːn/Definition of terne noun (also terne metal) [mass noun] a lead alloy containing about 20 per cent tin and often some antimony. (also terne plate) thin sheet iron or steel coated with terne. Origin: mid 19th century (denoting terne plate): probably from French terne 'dull, tarnished'terne in other Oxford dictionaries Definition of terne in the US English dictionary