- altocumulus
[altocumulus 词源字典]
- "Cloud forming a layer of rounded masses with a level base, occurring at medium altitude (typically 2 to 7 km, 6,500 to 23,000 ft)", Late 19th century: from modern Latin alto- (from Latin altus 'high') + cumulus.[altocumulus etymology, altocumulus origin, 英语词源]