adjective

1. Rare Mongolian
2. designating or of one of the major geographical varieties of human beings, including most of the peoples of Asia, the Eskimos, the North American Indians, etc., who are generally characterized by straight black hair, dark eyes with epicanthic folds, and relatively small stature: loosely called the yellow race
3. designating or affected with Down syndrome

noun

1. a member of the Mongoloid population of human beings
2. a person affected with Down syndrome