a woman who holds some title or property from her deceased husband, especially the widow of a king, duke, etc. (often used as an additional title to differentiate her from the wife of the present king, duke, etc.):
a queen dowager; an empress dowager.
an elderly woman of stately dignity, especially one of elevated social position:
a wealthy dowager.
noting, pertaining to, or characteristic of a dowager:
the dowager duchess; to prefer a dowager style of dress.