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Coalsack

or Coal Sack

[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 called Southern Coalsack.
Origin of Coalsack
1625-1635
1625-35; coal + sack1
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for coal sack
Historical Examples
  • In many regions its light is interrupted, especially in Centaurus, where a dark starless region exists, known as the "coal sack."

    Astronomy David Todd
  • This gulf of Cimmerian darkness was called by early navigators the coal sack.

British Dictionary definitions for coal sack

Coal Sack

noun
1.
a dark nebula in the Milky Way close to the Southern Cross
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for coal

6
8
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