From The Collaborative International Dictionary of English v.0.44 [gcide]:
Scoria \Sco"ri*a\, noun; pl. {Scori[ae]}. [L., fr. Gr. ?, fr. ? dung, ordure.]
1. The recrement of metals in fusion, or the slag rejected after the reduction of metallic ores; dross.
2. Cellular slaggy lava; volcanic cinders.
From WordNet (r) 2.0 [wn]:
noun
1: the scum formed by oxidation at the surface of molten metals [syn: {slag}, {dross}] [also: {scoriae} (pl)]
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
83 Moby Thesaurus words for "scoria": aa, abyssal rock, alluvion, alluvium, ash, ashes, basalt, bedrock, block lava, brand, brash, breccia, calx, carbon, charcoal, cinder, clinker, coal, coke, conglomerate, coom, crag, deposition, deposits, diluvium, draff, dregs, dross, druid stone, ember, feces, festooned pahoehoe, froth, fume, gneiss, granite, grounds, igneous rock, lava, lees, limestone, living rock, loess, magma, mantlerock, metamorphic rock, monolith, moraine, offscum, pahoehoe, pillow lava, porphyry, precipitate, precipitation, pudding stone, reek, regolith, rock, ropy lava, rubble, rubblestone, sandstone, sarsen, schist, scree, scum, sediment, sedimentary rock, settlings, shelly pahoehoe, silt, sinter, slag, smoke, smudge, smut, soot, stone, sublimate, sullage, talus, tufa, tuff
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