Proprietress
/prəˈpraɪətres/
Definition 1 of 1
Pro Tip 1/3Gender Specific
Used exclusively for women, mirroring 'proprietor' for men. 
After her husband passed, she became the proprietress of their vineyard.
Pro Tip 2/3Respect and Status
Conveys respect and a sense of the owner's direct involvement in the business. 
The proprietress greeted each guest personally at her bed and breakfast.
Pro Tip 3/3Formal Usage
More formal than 'owner'; may be used in official or historical contexts. 
The document listed her as the proprietress of the estate.