[kohl-sak] /ˈkoʊlˌsæk/

noun, Astronomy.
a dark nebula in the southern constellation Crux, whose dust particles obscure light from Milky Way stars behind it.


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    noun 1. a thick, black, viscid liquid formed during the distillation of coal, that upon further distillation yields compounds, as benzene, anthracene, and phenol, from which are derived a large number of dyes, drugs, and other synthetic compounds, and that yields a final residuum (coal-tar pitch) which is used chiefly in making pavements. noun 1. […]

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