Here are a few examples of how to use "arbitress" in a sentence:
* The queen, acting as the arbitress of the dispute, decreed that the land would be divided equally.
* In ancient Greek mythology, Athena was often portrayed as the arbitress of wisdom and justice.
* The jury acted as the arbitress of the defendant's fate, deciding whether he was guilty or innocent.
If you were looking for a different word, please provide more context or a similar word you might have been thinking of.