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yellow grease. In DICTIOUS you will not only get to know all the dictionary meanings for the word
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English
Pronunciation
Noun
yellow grease (uncountable)
- (idiomatic) Used vegetable oil purposed for use as biodiesel.
2008, Forest Gregg, Christopher Goodwin, SVO: powering your vehicle with straight vegetable oil, page 4:Using waste oil can be much less problematic, but in the US, waste oil is sold by rendering companies as yellow grease, and to a certain extent yellow grease is a substitute for fresh oil.