S.D. Codified Laws § 55-1-12
The person whose confidence creates a trust is called the trustor; the person in whom the confidence is reposed is called the trustee; and the person for whose benefit the trust is created is called the beneficiary. As used in this title, except as specifically provided in chapters 55-13 and 55-13A, the term, beneficiary, means a person that has a present or future beneficial interest in a trust, vested or contingent. A person is not a beneficiary solely by reason of holding a power of appointment or by reason of the existence or exercise of a discretionary power described in § 55-1-36.1 with respect to the person. As used in this title, except as provided in § 55-1-26, the term, power of appointment, means a power, including a withdrawal power as defined in § 55-1-24.2, to direct the disposition of trust property, but does not include the authority of a trustee to make a distribution to a beneficiary. A power of appointment is held by the person to whom the power has been given and once granted to a person, is not capable of appropriation or of manual delivery. A power of appointment is a general power of appointment if it is exercisable in favor of the person holding the power, the person's estate, the person's creditors, or the creditors of the person's estate, whether or not the power is also exercisable in favor of others. A power of appointment is a nongeneral power of appointment if it is not a general power of appointment. A holder of a general or nongeneral power of appointment may not be deemed a fiduciary unless otherwise provided for in the trust instrument. As used in this chapter, the term, person, has the meaning set forth in § 55-4-1.
SDCL 55-1-12