A cap or covering of clouds that sits on top of a mountain or hill, often formed when moist air rises and cools.
Compound of 'cloud' plus 'cap' (from Old French 'cape'), visualizing clouds as a literal cap or hat worn by a peak.
Mountain climbers absolutely hate cloudcaps because they can't see where they're going—but they're actually beautiful evidence of physics in action, showing exactly where air becomes cool enough for water to condense!
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