COMPOUNDER compounder (kom- or k[schwa]m-pown-d[schwa]r). 1. One who settles a dispute; the maker of a com-position. ¡ª Also termed amicable compounder. See COMPOSITION(1). 2. One who knows of a crime by another and agrees, for a promised or received reward, not to prosecute. How do Chinese lawyers translate the term COMPOUNDER?