Wordnet 3.0
NOUN (1)
1.
a trust that gives the trustee discretion to pay the beneficiary as much of the trust income as the trustee believes appropriate;
WordNet (r) 3.0 (2006):
discretionary trust
n 1: a trust that gives the trustee discretion to pay the
beneficiary as much of the trust income as the trustee
believes appropriate
Bouvier's Law Dictionary, Revised 6th Ed (1856):
DISCRETIONARY TRUSTS. Those which cannot be duly administered without the
application of a certain degree of prudence and judgment; as when a fund is
given to trustees to be distributed in certain charities to be selected by
the trustees.