das Hufeisen
horseshoe
A U-shaped piece of iron that is nailed onto a horse's hoof for protection.
Der Schmied musste dem Pferd ein neues Hufeisen anpassen.
The blacksmith had to fit the horse with a new horseshoe.

horseshoe
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horseshoe
A U-shaped piece of iron that is nailed onto a horse's hoof for protection.
Der Schmied musste dem Pferd ein neues Hufeisen anpassen.
The blacksmith had to fit the horse with a new horseshoe.

The word is a clear compound of 'Huf' (the hoof of a horse) and 'Eisen' (iron). So it is literally a piece of iron for the hoof.
Ein Pferd, das auf harten Wegen läuft, braucht ein Hufeisen zum Schutz.
A horse that walks on hard paths needs a horseshoe for protection.
In connection with horses, a horseshoe is 'aufgenagelt' (nailed on) or 'angepasst' (fitted) by a blacksmith. A horse can also 'verlieren' (lose) a horseshoe. The whole process is called 'das Pferd beschlagen' (to shoe the horse).
Mein Pferd hat gestern beim Ausritt ein Hufeisen verloren.
My horse lost a horseshoe yesterday during the ride.
As a good-luck charm, a horseshoe is traditionally hung with the opening facing upward. The superstition says that luck is 'aufgefangen' (caught) this way and cannot fall out.
Sie hat mir ein kleines Hufeisen als Glücksbringer für die Prüfung geschenkt.
She gave me a small horseshoe as a good-luck charm for the exam.
iron
'Eisen' and 'Hufeisen' are connected because a horseshoe is often made of iron or looks like a piece of iron. However, 'Eisen' is the material or an object made from this material. 'Hufeisen' is a specific U-shaped object that goes on a horse's hoof or is used as a good-luck charm. The words can be confused because 'Eisen' appears inside the word 'Hufeisen'. Even so, not every piece of iron is a horseshoe. If you are talking about the material, use 'Eisen'. If you mean the object for a horse or the good-luck charm, use 'Hufeisen'.

Über der Haustür hängt ein Hufeisen als Glücksbringer.
A horseshoe hangs above the front door as a good-luck charm.
Die alte Tür ist schwer, weil sie aus Eisen gemacht ist.
The old door is heavy because it is made of iron.