noun
fog, mist
B1
'Nebel' (der) means 'fog' or 'mist', referring to reduced visibility from water droplets. Masculine noun with plural 'Nebel' (same form), genitive 'des Nebels'. Often used in weather expressions like 'im Nebel'. Regular declension except its invariant plural; not reflexive and no special auxiliary.
Examples
Wegen dichten Nebels wurde die Autobahn gesperrt, sodass viele Fahrer eine Umleitung nehmen mussten.
Because of thick fog, the highway was closed, so many drivers had to take a detour.
Der Nebel war so dicht, dass man die Autos kaum sehen konnte.
The fog was so thick you could hardly see the cars.
Wegen des dichten Nebels konnte man kaum etwas sehen.
Because of the dense fog, one could hardly see anything.
Details
Mnemonics
Imagine a dense grey cloud labeled 'Nebel' rolling over a field
nebula (Latin for cloud) — sounds like 'Nebel'
der Nebel — think of the 'd' in der and in 'dense' fog (masculine)
Notes
Often used both for heavy fog and lighter mist; in meteorological contexts it's the standard word for fog.