noun
residue
REZ-ih-doo/ˈrezɪduː/
Material remaining after a process removes other parts.
A thin residue of sauce clings to the scraped saucepan.

Etymology
Latin residuum meant whatever was left behind after part was taken away. That general idea of a remainder applies directly to material surviving a process or removal.
In context
One of these scrapers after discovery was subjected to residue analysis, a chemical process that checks for ancient proteins.
More examples
- The tape leaves a sticky residue on the glass.
- After the water evaporates, a white residue remains.
- Rinse the shirt thoroughly to remove detergent residue.
Forms
residue · residues
residual adjective — Remaining after other parts are removed.