Meaning of the word residuum in English

What does residuum mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

residuum

US /rɪˈzɪd.ju.əm/
UK /rɪˈzɪd.ju.əm/

Noun

a small amount of something that remains after the main part has gone or been taken away

Example:
After the chemical reaction, a sticky residuum was left in the beaker.
The old traditions are just a residuum of a bygone era.