the world > physical sensation > cleanness and dirtiness > dirtiness > pollution or defilement > [noun] > specific impurities > sediment > of oil (3)
Plural foots. That which sinks to and lies at the bottom of something; esp. the dregs or remnants of a liquid; the refuse or remains resulting…
the dregs or remnants of a liquid; = sense A. 18.
A thick, semi-solid deposit that tends to form in oil when it is heated, exposed to the air, or mixed with another kind of oil.