dowager

A widow holding property or title derived from her late husband.

• A reclusive dowager owned the pastures across the river, and her farmhands ran beef cattle on them.

The widow of the holder of a title (usually a member of the peerage or a baronet); used in combination with the title she held during her husband's lifetime.

• the Earl and Countess of Whiteacre, and the Earl's mother, the dowager Countess of Whiteacre
• Sir George Sitwell, Bt. and Lady Sitwell, and Sir George's mother, the dowager Lady Sitwell

Any lady of dignified bearing, especially an older one.

• A stately dowager entered the ballroom, and all eyes were upon her.