stratus
Meteorological term for a low, uniform grayish cloud layer. Often used in weather forecasts and scientific contexts.
Tomorrow, stratus clouds will spread and it will likely be overcast.
high-level clouds; high clouds
low-level clouds; low clouds
mid-level clouds; middle clouds
nimbostratus
cirrostratus
altostratus clouds
From 層 (layer) + 雲 (cloud), a straightforward compound describing the cloud's layered appearance.