grand duch·ess
noun/ˌɡrænd ˈdʌtʃəs/
/ˌɡrænd ˈdʌtʃəs/
- the wife of a grand duke
大公夫人 - (in some parts of Europe, especially in the past) a female leader of a small independent state
（尤指旧时欧洲某些地方的）女大公 - (in Russia in the past) a daughter of the tsar
（旧时俄国的）公主