emulsifier

noun

substance that stabilizes an emulsion by increasing its kinetic stability

L320101 on Wikidata ↗

Wiktionary

Pronunciation: /ˈɪi.mʌl.sɪf.aɪ.ə(ɹ)/ / /əˈmʌl.sɪf.aɪ.ə(ɹ)/

noun

Etymology: Etymology tree English emulsify Proto-Indo-European *-yósder. Proto-Italic *-āzijos Latin -āriusnom. Latin -āriusbor. Proto-Germanic *-ārijaz Proto-West Germanic *-ārī Old English -ere Middle English -ere English -er English emulsifier From emulsify + -er.

A substance that helps an emulsion form, or helps keep an emulsion from separating.
“The lecithin in egg yolks is often used as an emulsifier.”