stratus
nounUK /ˈstrɑːtəs/
US /ˈstreɪtəs/
A stratus is a flat gray cloud that looks like a big blanket in the sky.
The sky was covered with stratus clouds all morning.
OTHER MEANINGS
2. A low, uniform cloud layer that often brings drizzle or light rain.
Stratus hung low over the hills, and a fine drizzle began to fall.
3. A cloud genus in meteorology characterized by a featureless, gray sheet.
Meteorologists classified the cloud as stratus because it formed a smooth, even layer.
4. A type of fog that forms when stratus clouds reach the ground.
By dawn, the stratus had descended and turned into thick fog.