Daily Almanac for
Nov 28, 2009
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na'creous cloud'




a rarely seen, luminous, iridescent cloud shaped like a cirrus or altocumulus, approximately 15 mi. (24 km) above the earth, and of unknown composition. Also called mother-of-pearl cloud.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

nacreousNAD
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