Merriam-Webster Collegiate Dictionary - chihuahua

 I. noun  Etymology: Mexican Spanish, from ~, Mexico  Date: 1858 any of a breed of very small roundheaded dogs that occur in short-coated and long-coated varieties  II. geographical name  1. state N Mexico bordering on the United States area 95,400 square miles (247,086 square kilometers), population 2,441,873  2. city, its capital metropolitan area population 530,487