residuum
nounUK /rɪˈzɪdjuəm/
US /rɪˈzɪdʒuəm/
The small bit of something that is left after the rest is gone.
After the fire, a fine gray residuum covered the ground.
OTHER MEANINGS
2. The substance that remains after a chemical process such as evaporation or filtration.
The residuum left in the flask was analyzed for trace metals.
3. The part of an estate that remains after all debts and specific gifts have been paid.
The residuum of the estate passed to the deceased's grandchildren.
4. In mathematics, the remainder left after division or subtraction.
The residuum after subtracting the two values was negligible.