noctilucent cloud
noun
noc·ti·lu·cent cloud ˌnäk-tə-ˈlü-sᵊnt- 
: a luminous thin usually colored cloud seen especially at twilight at a height of about 50 miles (80 kilometers)
Example Sentences
Recent Examples on the Web The team is the first to demonstrate noctilucent cloud formation is linked to water vapor cooling. 
Elizabeth Gamillo, Smithsonian Magazine, 10 Mar. 2021 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, 3 Mar. 2020 But as days get shorter with the onset of fall, noctilucent clouds will fade from view. Andrew Fazekas, National Geographic, 1 Aug. 2019 That water vapor is responsible for the brightening noctilucent clouds, the new study says. Rachel Becker, The Verge, 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, BostonGlobe.com, 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, 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, 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, 22 June 2017 See More
Elizabeth Gamillo, Smithsonian Magazine, 10 Mar. 2021 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, 3 Mar. 2020 But as days get shorter with the onset of fall, noctilucent clouds will fade from view. Andrew Fazekas, National Geographic, 1 Aug. 2019 That water vapor is responsible for the brightening noctilucent clouds, the new study says. Rachel Becker, The Verge, 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, BostonGlobe.com, 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, 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, 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, 22 June 2017 See More Word History
Etymology
noctilucent "luminous in the dark," from Latin noct-, nox night entry 1 + -i- -i- + lucent
First Known Use
circa 1934, in the meaning defined above
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