1º_ Feminine of "major", only as "position, hierarchy, head of a body" [note: this happens with the feminine of many titles, because in principle they were "the wives of . . . " and so they remained in the Spanish president, sergeant, judge, captain, . . . ] . 2º_ In Mexico there is the position of 'mayora (kitchen)' for the head of establishments with traditional cuisine, differentiated from signature cuisine.
terms of restaurants is the one person responsible for supervising, cooking, and season dishes, is usually a person who takes empirical knowledge in the kitchen, i.e. do not have studies, but are paid for their time and knowledge. It is always one greater Lady which can send in the kitchen like a chef.