1Of a cabbage or lettuce: having a whitish or very pale green heart.
Designating a type of malleable cast iron from which carbon has been removed by annealing at a high temperature in oxidizing conditions, leaving a structure of iron carbide in a metallic matrix.
1= white-heart cherry .
2US Whiteheart malleable cast iron.
Early 17th century (in an earlier sense). From white + heart.