residual
adjectiveUK /rɪˈzɪdjuəl/
US /rɪˈzɪdʒuəl/
Something residual is what is left over after the rest is gone.
After the rain stopped, there was still some residual water on the playground slide.
OTHER MEANINGS
2. A leftover amount or part that stays after the main part is gone.
The soap left a sticky residual on the sink.
3. In math, the small amount left over after dividing.
When you divide 10 by 3, the residual is 1.
4. In science, a small amount of something that stays behind after a process.
The lab tested the soil for residual chemicals.