powdered milk
US /ˈpaʊ.dərd ˌmɪlk/
UK /ˈpaʊ.dərd ˌmɪlk/

1.
milk that has been dried to a powder and can be reconstituted with water
:
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She added two spoons of powdered milk to her coffee.
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Powdered milk is often used in baking and for emergency food supplies.