Definition of Coalsack in English:

Coalsack

Syllabification: Coal·sack
Pronunciation: /ˈkōlsak
 
/
(the Coalsack) Astronomy
A dark nebula of dust near the Southern Cross that gives the appearance of a gap in the stars of the Milky Way.

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true