/ ˈkʌstəd; NAmE -tərd/ noun
1.
[ U ] ( especially BrE ) ( NAmE usually ˌcustard ˈsauce ) a sweet yellow sauce made from milk, sugar, eggs and flour, usually served hot with cooked fruit, puddings , etc. :
apple pie and custard
2.
[ C , U ] a mixture of eggs, milk and sugar baked until it is firm
For more information see the Cultural Guide
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WORD ORIGIN
late Middle English crustarde , custarde (denoting an open pie containing meat or fruit in a spiced or sweetened sauce thickened with eggs), from Old French crouste , from Latin crusta rind, shell, crust.