As an adjective dross
is brave, fearless, confident.
As a noun residue is
whatever remains after something else has been removed.
* (l) (obsolete)
Waste or impure matter
Worthless or trivial matter
Residue that forms on the surface of a metal from oxidation
The impurities in metal
A waste product from working with metal
To remove dross from.
Whatever remains after something else has been removed.
(chemistry) The substance that remains after evaporation, distillation, filtration or any similar process.
(legal) Whatever property or effects are left in an estate after payment of all debts, other charges and deduction of what is specifically bequeathed by the testator.
(mathematics) A form of complex number, proportional to the contour integral of a meromorphic function along a path enclosing one of its singularities.
* quadratic residue