noun /ˈkʌs.tə(ɹ)d/
a) A type of sauce made from milk and eggs (and usually sugar, and sometimes vanilla or other flavourings) and thickened by heat, served hot poured over desserts, as a filling for some pies and cakes, or cold and solidified; also used as a base for some savoury dishes, such as quiches.
b) Any particular variety of custard.
Wikipedia foundation.