Definitions for mackerel sky
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Random House Webster's College Dictionary
mack′erel sky′(n.)
a sky marked by cirrocumulus or altocumulus clouds scattered like the markings on a mackerel's back.
Category: Meteorology
Origin of mackerel sky:
1660–70
Princeton's WordNet
mackerel sky(noun)
a sky filled with rows of cirrocumulus or small altocumulus clouds
Wiktionary
mackerel sky(Noun)
a sky filled with a regular pattern of altocumulus clouds somewhat resembling the skin of a mackerel.
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"mackerel sky." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/mackerel sky>.