COMULO no term exists. Probable error by cluster or cumulus 1 . Accumulation of material or immaterial things: the accident was due to an accumulation of errors. 2 . A type of white cloud, usually dense and having a cottony shape and defined outline. The lower part is wider and stretched while the upper part is shaped like cauliflowered dominoes. Combinations with other types such as nimbus occur and are then called cúmulonimbus. There are also the altocumulus, cirrocumulus and the stratocumulus.