Simple Definition of cirrus

from our Learner's Dictionary

cirrus

noun

ˈsirəs How to pronounce cirrus (audio)
technical : a thin type of cloud that forms high in the sky

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“Cirrus.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/cirrus. Accessed 15 Apr. 2026.

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