residuary

Short definition from Wiktionary

Adjective

1. 1
   Of or relating to a residue; residual; left over, when the main portion has been removed.
2. 2
   With respect to a will, relating to the portion of an estate which was not disposed of in the will, or for which the directions in the will could not be carried out.

Noun

1. 1
   One who receives the residue of an estate.