Examples from literature

• Cumulus and cirrus clouds are white. 
• He paints, as a rule, the rolling cumulus, and is one of the first of the younger artists. 
• In the hot air a bank of cumulus clouds glowed red as from a distant conflagration. 
• The back drop should be of light blue with a few cumulus clouds in white. 
• The cumulus was changing to the nimbus. 
• We should have seen the sun to-day, but a bank of cumulus effectually hid him, although the daylight is a never-ending joy.