Answer: residuum

AnswerCrossword Clue
residuumquantity or body of matter remaining after evaporation, combustion, distillation, etc.
residuumthe residue, remainder, or rest of something.
residuumany residual product
residuumthe residue of an estate
residuumresidue (that which is left)
residuumthe residue, remainder, or rest of something