Take the Caucasian (., Caucasoid) race . The physical characteristics of Caucasians were described by M. A. MacConaill, an Irish anatomy professor, as including "light skin and eyes, narrow noses, and thin lips. Their hair is usually straight or wavy." Caucasians are said to have the lowest degree of projection in their alveolar bones that contain the teeth, a notable size prominence of the cranium and forehead region, and a projection of the midfacial region. A person whose appearance matches these characteristics is said to be a Caucasian. Caucasians don't always have white skin but in the United States "caucasian" is commonly used to mean white people.