residuum

Something remaining after removal of a part; a residue.

In geology, the insoluble remainder left behind during processes of rock-weathering by the removal of the soluble portion.

That which is left after any process; that which remains; a residue.

Specifically, in late, that part of an estate which is left after the payment of charges, debts, and particular bequests; more strictly, the part so left which is effectively disposed of by a residuary clause.

That which is left after any process of separation or purification; that which remains after certain specified deductions are made; residue.