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Wiktionary
egg wash

alt. Egg (yolk or white) mixed with a little milk; brushed on pastry before baking to give a glazed appearance n. Egg (yolk or white) mixed with a little milk; brushed on pastry before baking to give a glazed appearance

Wikipedia
Egg wash

An egg wash is beaten eggs, sometimes mixed with another liquid such as water or milk, which is brushed onto the surface of a pastry before baking. Egg washes are also used as a step in the process of breading foods, providing a substrate for the breading to stick to. Egg washes can also be used on calzoni or on fish.

Usage examples of "egg wash".

After brushing the lot of them with egg wash, he popped them into the oven.