Residue (noun)

1. A remaining part or substance after a larger part has been removed, separated, or used.
2. The substance left behind after a chemical reaction or processing.

Origin:

The word residue comes from the late 16th century, derived from the latin word 'residuum' meaning something remaining.

Examples:

1. The residue of the soap in the bottle made it difficult to dispense the liquid.
2. The residue from the burning of the wood was a black powder that covered everything in the room.
3. The scientist analyzed the residue from the experiment to determine the composition of the sample.
4. The residue on the plate was scraped into the trash, as it was no longer edible.
5. The residue in the wine glass was a small amount of wine that was not drained out.