As a noun residue is
whatever remains after something else has been removed.
Not English Thefiltrate has no English definition. It may be misspelled.
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