(of a material) Resembling or containing slag.
1834, Robert Allan, Abstract of a Paper accompanying a Suite of Volcanic Rocks from the Lipari Islands, Transactions of the Royal Society of Edinburgh, Volume 12, [http://books.google.com.au/books?id=1eYxAQAAMAAJ&pg=PA532&lpg=PA532&dq=%2…
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(UK, Australia, New Zealand, Ireland, pejorative) Resembling or characteristic of a slag; slutty, promiscuous.
: Some portions of this obsidian are less compact, and in No, 2. we remark indications of a more slaggy structure, with several white veins intersecting the black surface in a very beautiful manner.
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