Definition of lecithin in US English:



  • A substance widely distributed in animal tissues, egg yolk, and some higher plants, consisting of phospholipids linked to choline.

    • ‘The lecithin derived from soy is used solely as a component of a release agent as described in this guidance.’
    • ‘Since lecithin acts as an emulsifier, it will make whatever you mix it with smoother and creamier.’
    • ‘Soy and egg are common allergens, so for some people dietary supplements containing lecithin may not be safe.’
    • ‘Mom may need to continue taking 1-2 capsules per day if stopping the lecithin leads to additional plugged ducts.’
    • ‘The line of lecithin offered is suitable for both food and cosmetic purposes.’


Mid 19th century: from Greek lekithos ‘egg yolk’ + -in.