Dutch word loch comes from Proto-Indo-European *lewg-, and later Proto-Germanic *luką (An opening; aperture; hole. Lock. Shutter.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *lewg- | Proto-Indo-European (ine-pro) | |
| *luką | Proto-Germanic (gem-pro) | An opening; aperture; hole. Lock. Shutter. |
| *lauka | Proto-Germanic (gem-pro) | |
| loh | Old High German (goh) | |
| louh | Old High German (goh) | |
| loch | Middle High German (gmh) | |
| Loch | German (deu) | (colloquial) apartment, flat or house in a bad condition; dump. (colloquial) boring small town or village. (dentistry) cavity. Hole. |
| loch | Dutch (nld) |