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Coalsack

or Coal Sack

[ kohl-sak ]
/ ˈkoʊlˌsæk /
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noun Astronomy.

a dark nebula in the southern constellation Crux, whose dust particles obscure light from Milky Way stars behind it.

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Also called Southern Coalsack.

Origin of Coalsack

First recorded in 1625–35; coal + sack1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for Coalsack

Coal Sack

noun

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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