n.
- The vitreous mass left as a residue by the smelting of metallic ore.
- See scoria (sense 1).
To change into or form slag.
[Low German slagge, from Middle Low German.]
slaggy slag'gy adj.
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.