emulsion

Estimated CEFR level: C2 — Proficiency

Estimated from word frequency; not an official CEFR classification.

Definition

noun (chemistry) a colloid in which both phases are liquids
noun a light-sensitive coating on paper or film; consists of fine grains of silver bromide suspended in a gelatin

Borrowed from French émulsion, from New Latin ēmulsiō, ēmulsiōnis, based on Latin ēmulgeō (“to milk out, extract”).

If he does not—we must see what emulsion of cod-liver oil will do.” — Rainbow Valley, L. M. (Lucy Maud) Montgomery
Very often a mixture of soap and kerosene oil, known as "kerosene emulsion," is used to spray with. — The Insect Folk, Morley, Margaret Warner
Evidently, if the emulsion had slowed, the shutter had slowed also; so opportunity was awaited to make a more decisive test. — Ten Thousand Miles with a Dog Sled: A Narrative of Winter Travel in Interior Alaska, Hudson Stuck

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