Coalsack

 [kohl-sak]  

Coal·sack

   [kohl-sak]
noun Astronomy.
a dark nebula in the southern constellation Crux, whose dust particles obscure light from Milky Way stars behind it.
Also, Coal Sack.
Also called Southern Coalsack.

Origin:
1625–35; coal + sack1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Coalsack is always a great word to know.
So is crescent. Does it mean:
the Ram, a zodiacal constellation between Pisces and Taurus
the figure of the moon in its first or last quarter, resembling a segment of a ring tapering to points at the ends
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Related Words
Southern Coalsack
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