Merriam-Webster Collegiate Dictionary - han

 I. noun  Etymology: Chinese (Beijing) Han  Date: 1736  1. a Chinese dynasty dated 206B.C.-A.D.220 and marked by centralized control through an appointive bureaucracy, a revival of learning, and the penetration of Buddhism  2. the Chinese peoples especially as distinguished from non-Chinese (as Mongolian) elements in the population  II. geographical name  1. river E central China in Shaanxi & Hubei flowing SE into the Chang  2. river about 300 miles (483 kilometers) N central South Korea flowing W & NW into Yellow Sea