积雨云 Traditional form: 積雨雲 Pinyin (reading): jīyǔyún Definitions: cumulonimbus (cloud) Characters: 积 - to store up, to amass, to accumulate 雨 - rain 云 - cloud; to say, to speak Traditional characters: 積 - to store up, to amass, to accumulate 雨 - rain 雲 - cloud; to say, to speak