RESIDUE – the surplus of a testator’s estate when all other obligations have been legally taken care of
Merriam-Webster Online Dictionary
residue (noun) something that remains after a part is taken, separated, or designated or after the completion of a process as - remnant remainder
a) the part of a testator's estate remaining after the satisfaction of all debts, charges, allowances, and previous devises and bequests
b) the remainder after subtracting a multiple of a modulus from an integer or a power of the integer that can appear as the second of the two terms in an appropriate congruence - 2 and 7 are residues of 12 modulo 5
c) a constituent structural unit (as a group or monomer) of a usually complex molecule - amino acid residues from hydrolysis of protein