noun 1.a facsimile, for use in printing, of a block of
type, an engraving, or the like, consisting of a thin copper or nickel shell deposited by electrolytic action in a wax, lead, or plastic mold of the original and backed with lead alloy.
verb (used with object) 3.to make an electrotype of.
Related forms e·lec·tro·typ·er, noun