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nacreous cloud

[ nākrē-əs ]
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A cloud resembling a cirrus, showing iridescent coloration when the Sun is several degrees below the horizon. These clouds appear mostly during winter in regions of high latitude.
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QUIZ YOURSELF ON "WAS" VS. "WERE"!
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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