Coalsack Definition

kōlsăk
noun
A dark nebula, one of the nearest to Earth, that appears in the southern Milky Way.
American Heritage
A prominent dark nebula in the Milky Way near the constellation Crux.
Webster's New World

A sack for carrying coal.

Wiktionary

Other Word Forms of Coalsack

Noun

Singular:
Coalsack
Plural:
coalsacks

Origin of Coalsack

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Coalsack