Coalsack definition

kōlsăk
A dark nebula, one of the nearest to Earth, that appears in the southern Milky Way.
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A similar dark nebula in the Northern Hemisphere near the constellation Cygnus.
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(astron., place, proper) A prominent dark nebula in the Milky Way near the constellation Crux.
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A sack for carrying coal.
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Other Word Forms

Noun

Singular:
coalsack
Plural:
coalsacks

Origin of coalsack