(n.) Any one of the spaces in the Milky Way which are very black, owing to the nearly complete absence of stars; especially, the large space near the Southern Cross sometimes called the Black Magellanic Cloud.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). coalsack. Retrieved September 21, 2026, from http://smartdefine.org/coalsack/definitions/1988479 |
| Chicago | Webster's. 2011. "coalsack" http://smartdefine.org/coalsack/definitions/1988479 (accessed September 21, 2026). |
| Harvard | Webster's 2011, coalsack, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/coalsack/definitions/1988479>. |
| MLA | Webster's. "coalsack" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/coalsack/definitions/1988479> |