waste

https://doi.org/10.1351/goldbook.13963
Residue left when a compound or a product reaches the end of its initial usefulness.
Notes:
  1. Also referred to as rubbish, trash, garbage, or junk depending upon the type of material and the regional terminology.
  2. In living organisms, waste relates to unwanted substances or toxins that are expelled from them.
Source:
PAC, 2012, 84, 377. (Terminology for biorelated polymers and applications (IUPAC Recommendations 2012)) on page 406 [Terms] [Paper]