#emulsifier  a surface-active agent that promotes the formation of an emulsion
  supertype:  #wetting_agent__wettingagent__wetter__surfactant__surface-active_agent  a substance capable of reducing the surface tension of a liquid in which it is dissolved
  subtype:  #lecithin  a yellow phospholipid essential for the metabolism of fats; found in egg yolk and in many plant and animal cells; used commercially as an emulsifier

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