residuum

1. Something remaining after removal of a part; a residue.
2. Law. See residue (sense 3).

[Latin, residue. See residue.]

That which remains after any process of separation or deduction; a balance; that which remains of a decedent's estate after debts have been paid and gifts deducted.

Something remaining after removal of a part; a residue.

The noun has one meaning:

Meaning #1: something left after other parts have been taken away
  Synonyms: remainder, residual, residue, rest