Black's Law Dictionary (2nd edition)dictionaries

Fidei-Commissarius

In the civil law thls term corresponds nearly to our “cestui que trust.” It designates a person who has the real or beneficlal Interest in an estate or fund, the title or administration of which is temporarily confided to another. See Story, Eq. Jur. | 966

Source: Black’s Law Dictionary 2nd Ed (1910)