Geology Porous cinderlike fragments of dark lava. Also called cinders, slag.(noun)
Metallurgy The refuse of a smelted metal or ore; slag. Also called cinder.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "scoria" in a sentence
"From the observatory, where His Majesty's faithful servant still remains, come telegrams that the great pebbles -- what we call scoria -- have ruined"
"Porcellanite (also called scoria or clinker) forms from the natural burning of coal beds; it caps the hills with distinctive red-orange rock."
"There are tracts of these which are in part or wholly of volcanic origin; then the hills are called scoria buttes."