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Coalsack

American  
[kohl-sak] / ˈkoʊlˌsæk /
Or Coal Sack

noun

Astronomy.

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

Etymology

Origin of Coalsack

First recorded in 1625–35; coal + sack 1

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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