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7 Essential Words of Fall

noctilucent

[nok-tuh-loo-suh nt] /ˌnɒk təˈlu sənt/
adjective, Meteorology
1.
(of high-altitude clouds) visible during the short night of the summer.
Origin
1885-1890
1885-90; nocti- + lucent
Related forms
noctilucence, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for noctilucent
  • They are among the first such noctilucent clouds pictured this year.
  • After asking several astronomers, they are possible noctilucent clouds, airglow or faint aurora.
  • They are called noctilucent clouds, or night-shining clouds.
  • For years, scientists have puzzled over the observed increase in these noctilucent clouds.
  • These clouds are known as nacreous and noctilucent clouds respectively.
British Dictionary definitions for noctilucent

noctilucent

/ˌnɒktɪˈluːsənt/
adjective
1.
shining at night, usu. of very thin high altitude clouds observable in the summer twilight sky
Derived Forms
noctilucence, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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noctilucent in Science
noctilucent
  (nŏk'tə-l'sənt)   
Luminous at night. The term is used especially to describe certain high atmospheric cloud formations visible during summer nights at high latitudes.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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