English dictionary
coalsack
/'k/oU/l,s/&/k/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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Any one of the spaces in the Milky Way which are very black, owing to the nearly complete absence of stars; esp., the large space near the Southern Cross sometimes called the <i>Black Magellanic Cloud</i>.
Source: webster1913