overplus
That which remains beyond what is necessary or required; a surplus.
countable, uncountable
Where some for an over-plus, or supererogation have added this necessaity, that they must necessarily accompany them, as well in death, as in life.
Where it comes from
From over- + Anglo-Norman plus, Middle French plus.
Adapted from the Wiktionary entry overplus (CC BY-SA 4.0).