noctilucent cloud

noc·​ti·​lu·​cent cloud | \ ˌnäk-tə-ˈlü-sᵊnt- How to pronounce noctilucent cloud (audio) \

Definition of noctilucent cloud

: a luminous thin usually colored cloud seen especially at twilight at a height of about 50 miles (80 kilometers)

Examples of noctilucent cloud in a Sentence

Recent Examples on the Web Agencies could educate employees on how to recognize high-altitude balloons hit by moonlight, fireballs that look like floating orbs, noctilucent clouds that resemble extraterrestrial neural networks. Sarah Scoles, Wired, "How UFO Sightings Became an American Obsession," 3 Mar. 2020 But as days get shorter with the onset of fall, noctilucent clouds will fade from view. Andrew Fazekas, National Geographic, "Perseids peak, and more top stargazing events in August," 1 Aug. 2019 That water vapor is responsible for the brightening noctilucent clouds, the new study says. Rachel Becker, The Verge, "How to capture the eerie nighttime clouds of climate change," 6 July 2018 Researchers used computer simulations to model the Northern Hemisphere’s atmosphere and noctilucent clouds from 1871 to 2008, according to the study, which was published last week in the journal Geophysical Research Letters. Katie Camero,, "Once-rare cloud is now more common, and new study says climate change is to blame," 13 July 2018 The first time people reported noticing noctilucent clouds was in 1880s after the massive eruption of Krakatau, a volcano in Indonesia. Rachel Becker, The Verge, "How to capture the eerie nighttime clouds of climate change," 6 July 2018 What caught my eye, and the eyes of several other meteorologists, was the idea that these could be noctilucent clouds, instead. Kathryn Prociv, Washington Post, "Extremely rare, colorful nighttime clouds shine over Arizona," 30 Mar. 2018 People living in high latitude areas (between 45º and 70º above or below the Equator) have the best chance of seeing noctilucent clouds. Andrew Fazekas, National Geographic, "Eerie Clouds Glow at Night—How to See Them," 22 June 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'noctilucent cloud.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of noctilucent cloud

circa 1934, in the meaning defined above

History and Etymology for noctilucent cloud

noctilucent "luminous in the dark," from Latin noct-, nox night entry 1 + -i- -i- + lucent

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The first known use of noctilucent cloud was circa 1934

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Cite this Entry

“Noctilucent cloud.” Dictionary, Merriam-Webster, Accessed 25 Oct. 2020.

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