a princess who is regent of a country.
the wife of a prince regent.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use princess regent in a sentence
The princess regent, seated on her throne, close to the scaffold, had held on high the holy sword.The Rise of the Dutch Republic, Volume I.(of III) 1555-66 | John Lothrop Motley