adj. shining in the night; said esp. of high-altitude clouds -75 to 90 km or 46 to 56 mi above the earth- that reflect twilight to the earth
The sky was black; and then sometimes there would appear noctilucent clouds.
The sky was black; and then sometimes there would appear noctilucent clouds.
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bright; shining in the night; visible
dull
4 syllables
noc-ti-lu-cent
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