名詞 cumulonimbus:

1. a dark cloud of great vertical extent charged with electricity; associated with thunderstorms
   同義詞：cumulonimbus cloud, thundercloud

cu.mu.lo.nim.bus

n.（名詞）
【復(fù)數(shù)】 cu.mu.lo.nim.bus.es 或 cu.mu.lo.nim.bi [-bo]
An extremely dense, vertically developed cumulus with a relatively hazy outline and a glaciated top extending to great heights, usually producing heavy rains, thunderstorms, or hailstorms.
積雨云：一種極其濃密的、垂直擴(kuò)展的積云，其輪廓比較模糊，頂部覆有冰晶且向上伸入高空，通常能產(chǎn)生大雨、雷暴或雹暴