res·i·due 
(rĕzĭ-d′, -dy′)
(rĕzĭ-d′, -dy′)n.
1. The remainder of something after removal of parts or a part.
2.
a. Matter remaining after completion of an abstractive chemical or physical process, such as evaporation, combustion, distillation, or filtration; residuum.
b. The part of a monomer or other chemical unit that has been incorporated into a polymer or large molecule.
3. Law The remainder of a testator's estate after all specific bequests and applicable debts and expenses have been disposed of. Also called residuum.
[Middle English, from Old French residu, from Latin residuum, neuter of residuus, remaining, from residēre, to remain behind; see RESIDE.]
re·sidu·ar·y (rĭ-zĭj-ĕr′ē) adj.