|Origin:||residu, from Latin residuum, from residere; RESIDE|
1HC [uncountable and countable]
a substance that remains on a surface, in a container etc and cannot be removed easily, or that remains after a chemical process
residue from sewage treatment plants
The flies leave a sticky residue on crops.
Rinse off any soap residue.
2 [countable] formal
the part of something that is left after the rest has gone or been taken away
The residue of the stock was sold.