cumulus

Etymology

Borrowed from Latin cumulus. Doublet of comble.

noun

1. A large white puffy cloud that develops through convection. On a hot, humid day, they can form towers and even become cumulonimbus clouds.
   2007 September 1, "Who’s afraid of Google?: The world’s internet superpower faces testing times", in The Economist, The Economist Newspaper Ltd, ISSN 0013-0613, volume 384, number 8544, page 9, Ironically, there is something rather cloudlike about the multiple complaints surrounding Google. The issues are best parted into two cumuli: a set of “public” arguments about how to regulate Google; and a set of “private” ones for Google’s managers, to do with the strategy the firm needs to get through the coming storm.
2. A mound or heap.