Other forms: duchesses
A duchess is a female member of a royal or noble family. If a woman marries a duke, she becomes a duchess.
Many duchesses inherit their title when they're born — there are still hereditary dukes and duchesses in the U.K., for example. In other cases, a woman marries into a noble family and finds herself with the title. The word duchess comes from the feminine form of the Latin dux, "leader or commander."