Plural form: multiple mixtures of two liquids that don't normally blend, like oil and water, kept smooth and uniform using special agents.
Plural of emulsion, from Latin emulgere (to milk out) + -ion (suffix forming nouns). The term compares the milky appearance to milk itself.
Nature makes emulsions all the time—milk itself is an emulsion of fat in water, mayonnaise is oil in vinegar and water, and your skin's natural oils form an emulsion with your sweat to protect you!
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