Refers to solid or semi-solid remains left after a process, such as coffee grounds, tea leaves, or industrial residue. Often used in technical or formal contexts.
They remove the residue left in the filter.
Please throw away the coffee grounds.
This liquid contains a lot of sediment.
The researcher analyzed the residue left after the reaction.
After evaporation, residue remained at the bottom of the container.
沈殿物 specifically means sediment that has settled at the bottom of a liquid, whereas 残渣 covers any leftover solid residue from a process, not just settling.
Compound of 残 (ざん, 'remain') and 渣 (さ, 'dregs'). The kanji 渣 is relatively uncommon and primarily appears in this compound.