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Coalsack

[kohl-sak] /ˈkoʊlˌsæk/
noun, Astronomy
1.
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
1625-1635
1625-35; coal + sack1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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