cu·mu·lus /-ləs/
  積雲,堆積
  cu·mu·lus /ˈkjumjələs/ 名詞
  丘,積雲
  Cu·mu·lus n.; pl. Cumuli   Meteor. One of the four principal forms of clouds. SeeCloud.
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  cumulus
       n 1: a globular cloud [syn: cumulus cloud]
       2: a collection of objects laid on top of each other [syn: pile,
           heap, mound]
       [also: cumuli (pl)]