grande dame

noun, plural grandes dames [gran damz, deymz; French grahnd dam] /ˈgræn ˈdæmz, ˈdeɪmz; French grɑ̃d ˈdam/.

1. a usually elderly woman of dignified or aristocratic bearing.
2. a woman who is the doyenne of a specific field: a grande dame of the American theater.

noun

1. a woman regarded as the most experienced, prominent, or venerable member of her profession, etcthe grande dame of fashion