A nimbus cloud is a type of cloud that is associated with precipitation. These clouds are typically thick and dark, indicating that they are filled with moisture. When you see a nimbus cloud, it often means that rain, snow, or other forms of precipitation are likely to occur. The term "nimbus" comes from the Latin word for "rain." There are different types of nimbus clouds, including nimbostratus and cumulonimbus. While nimbostratus clouds bring steady rain, cumulonimbus clouds can produce thunderstorms and severe weather, making them important for meteorologists to study.