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Wikipedia definition
1. Altocumulus castellanus cloudAltocumulus Castellanus (ACCAS) is named for its tower-like projections that billow upwards from the base of the cloud. The base of the cloud can form as low as 2,000 metres (6,500 feet), or as high as 6,000 metres (20,000 feet). Castellanus clouds are evidence of mid-atmospheric instability and a high mid-altitude lapse rate.
Read “Altocumulus castellanus cloud” on English Wikipedia
Read “塔状雲” on Japanese Wikipedia
Read “Altocumulus castellanus cloud” on DBpedia

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