From Longman Dictionary of Contemporary Englishmayoressmayor‧ess /ˈmeərɪs $ ˈmeɪərɪs/ noun [countable] British EnglishPGO the wife of a mayor, or a woman who shares the work of a mayor
Examples from the Corpus
mayoress• His wife, Lillian, was invested as mayoress.• Yesterday she and her mayoress, daughter Linda Charles, toured the school in the company of Coun Fishwick.• The mayor, the mayoress and an obscure royal rode in the first sleek open limousine.• The mayoress appealed to them to drop the case and this is now being considered by the Crown Prosecution Service. 