from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A stratospheric cloud resembling a cirrus, showing iridescent coloration when the sun is several degrees below the horizon.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
polar stratospheric cloud
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a luminous iridescent cloud at a high altitude that may be seen when the sun is a few degrees below the horizon
from The American Heritage® Dictionary of the English Language, 4th Edition
[From nacre (from the iridescent coloring of mother-of-pearl).]
Sorry, no example sentences found.