cirrus cloud

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cirrus cloud

A single cirrus cloud drifts high in the blue sky.

Definition
  1. Noun:
    • A high-altitude cloud: A cirrus cloud is a type of cloud that forms at very high altitudes, typically between 4 to 8 miles (6.5 to 13 kilometers) above the Earth's surface.
    • Composition and appearance: It is composed primarily of tiny ice crystals and appears as thin, wispy, feathery, or hair-like white strands or patches in the sky.
Examples of Usage
  • Noun:
    • The sky was a clear blue, streaked with delicate cirrus clouds.
    • Meteorologists noted that the approaching cirrus clouds often indicate a change in the weather.
Advanced Usage
  • "Cirrus uncinus": A specific type of cirrus cloud with a characteristic hook shape.
    • The sky was filled with cirrus uncinus, their hooked ends pointing in the direction of the upper air flow.
  • "Cirrus spissatus": A dense, thick patch of cirrus cloud.
    • The cirrus spissatus near the horizon made the sunset particularly dramatic.
Variants and Related Words
  • Cirro- (prefix): A prefix used in cloud classification for high-altitude clouds. (e.g., cirrocumulus, cirrostratus).
  • Cirriform (adj): Having the form or appearance of cirrus clouds.
    • The cirriform clouds created a beautiful, textured sky.
Synonyms
  • Mare's tail: An informal term for cirrus clouds, especially when they are long and wispy.
  • Feather cloud: A descriptive synonym emphasizing the cloud's delicate, feather-like appearance.
Related Phrases
  • "Cirrus cloud deck": A layer of the sky covered by cirrus clouds.
    • The pilot ascended above the cirrus cloud deck into clearer air.
  • "Cirrus veil": A thin, widespread layer of cirrus clouds that can obscure the sun or moon, creating a halo effect.
    • A cirrus veil covered the sun, creating a beautiful ring of light.
Related Idioms
  • "A mackerel sky": While not exclusive to cirrus clouds, this idiom describes a sky with cirrocumulus clouds (a related high-altitude type) that resembles fish scales, often preceding a weather front.
    • "Mackerel sky, mackerel sky, never long wet and never long dry," is an old saying about such skies.
cirrus cloud

A single cirrus cloud drifts high in the blue sky.

Noun
  1. a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles)

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