Tu•men(ty′mœn′),USA pronunciationn.[Pinyin, Wade-Giles.]a river in E Asia, flowing NE along the China-North Korea border and then SE along the border between China and Russia to the Sea of Japan. ab. 325 mi. (525 km) long. Also called,[Wade-Giles,]Tu′men′ Chiang′(jyäng);USA pronunciationPinyin,Tu′men′ Jiang′(jyäng).USA pronunciation