
das Eiweiß
protein
A nutrient (protein) that is essential for building and maintaining body cells, muscles, and tissue.
Sportler achten oft auf eine Ernährung, die reich an Eiweiß ist.
Athletes often pay attention to a diet that is rich in protein.
protein / egg white
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protein
A nutrient (protein) that is essential for building and maintaining body cells, muscles, and tissue.
Sportler achten oft auf eine Ernährung, die reich an Eiweiß ist.
Athletes often pay attention to a diet that is rich in protein.

egg white
The clear, liquid part inside an egg that becomes white and firm when heated. Also called albumen.
Für das Baiser benötigst du nur das Eiweiß, nicht das Eigelb.
For the meringue, you only need the egg white, not the yolk.
The word is made up of 'Ei' (egg) and 'weiß' (white) and literally means 'the white of the egg'. Since this part of the egg is rich in proteins, the meaning was extended to the nutrient protein in general.
Schlage das Eiweiß zu steifem Schnee.
Beat the egg white until stiff.
The context makes the meaning clear. If you are talking about cooking or baking, it refers to the part of the egg. If it is about nutrition, sports, or biology, it refers to the nutrient protein.
Für dieses Rezept brauchen wir nur das Eigelb, nicht das Eiweiß.
For this recipe, we only need the yolk, not the egg white.
When it is about the nutrient, typical formulations are 'reich an Eiweiß sein' (to be rich in protein), 'den Eiweißbedarf decken' (to meet one's protein needs), or 'Eiweiß für den Muskelaufbau benötigen' (to need protein for muscle building).
Quark ist besonders reich an Eiweiß.
Quark is especially rich in protein.
When it is about the part of the egg, typical verbs are '(vom Eigelb) trennen' (to separate from the yolk) and 'steif schlagen' (to beat until stiff). It is also often called 'Eiklar' (egg white).
Zuerst müssen Sie das Eiweiß vom Eigelb sorgfältig trennen.
First, you must carefully separate the egg white from the yolk.
protein
Protein and Eiweiß refer here to the same nutrient. Protein is used especially in scientific or medical texts. Eiweiß is the familiar term in conversations about nutrition and food; in this comparison, it does not refer to the liquid part of an egg.

Beim Einkaufen achte ich auf Lebensmittel mit viel Eiweiß.
When shopping, I look for foods that are high in protein.
Die Ernährungsstudie untersucht den Anteil an Protein in verschiedenen Hülsenfrüchten.
The nutrition study examines the protein content of various legumes.