A cloud formation type (fibratus) having a delicate, hair-like or thread-like appearance in the sky.
From Latin 'fibratus' meaning fibered or thread-like, derived from 'fibra' (fiber), used in the WMO cloud classification system adopted in the 19th century.
Fibratus clouds are those delicate, wispy clouds that look like someone drew them with white pencil strokes across the sky—meteorologists named them this way to describe how the ice crystals align like fibers.
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