appointor
noun
ap·poin·tor
| \ əˌpȯin‧ˈtȯ(ə)r also ˌaˌp- or əˈpȯintər sometimes əˌpȯint‧ˈȯ(ə)r or əˈpȯin‧ˌtȯ- or əˈpȯint‧ˌȯ-\
plural -s
Definition of appointor
: one that appoints an estate under a power of appointment