Greasy liquids that can come from plants, animals, or minerals, and don't mix with water.
From Old French 'oile' and Latin 'oleum,' likely from a Semitic root. The word has meant a slippery substance since ancient times, essential to cooking, medicine, and religious rituals.
Essential oils became a huge wellness trend recently, but ancient Egyptians were using oils for perfume and medicine 5,000 years ago—they even used them in the mummification process.
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