From The Collaborative International Dictionary of English v.0.44 [gcide]:
From WordNet (r) 2.0 [wn]:
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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