'Op der Millen' means at the mill.
'Millen' is Luxembourgish for mill, both the machine and the building that houses it. So the name points to a mill here. We have not yet found out which mill it was or when it worked.
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Sources
- Millen Lëtzebuerger Online Dictionnaire
This text was written with the help of AI from the sources above and checked against them.