fiduciary (
http://definr.com/fiduciary)
adj : relating to or of the nature of a legal trust (i.e. the
holding of something in trust for another); "a
fiduciary contract"; "in a fiduciary capacity";
"fiducial power" [syn:
fiducial]
n : a person who holds assets in trust for a beneficiary; "it is
illegal for a fiduciary to misappropriate money for
personal gain"