baroness

Từ điển Oxford Advanced Learner 8th

bar·on·ess [baroness baronesses] BrE [ˈbærənəs] NAmE [ˌbærəˈnes] noun
1. a woman who has the same rank as a ↑baron. In Britain, baronesses use the title Lady or Baroness
•Baroness Thatcher
2. the wife of a ↑baron

Word Origin:
late Middle English: from Old French baronesse, from baron, from medieval Latin baro, baron- ‘man, warrior’, probably of Germanic origin.