noctilucent
(noc-ti-lu-cent)
4 syllables
Definition
adjective. shining in the night; said esp. of highaltitude clouds 75 to 90 km or 46 to 56 mi above the earth that reflect twilight to the earth
Example Sentence
The sky was black; and then sometimes there would appear noctilucent clouds.
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noctilucent
