electroless plating

[ ih-lek-troh-lis ]
/ ɪˈlɛk troʊ lɪs /

noun

a technique of plating metal by chemical rather than electrical means, in which the piece to be plated is immersed in a reducing agent that, when catalyzed by certain materials, changes metal ions to metal that forms a deposit on the piece.

Origin of electroless plating