| Dross 1. (n.) The scum or refuse matter which is thrown off, or falls from, metals in smelting the ore, or in the process of melting; recrement. 2. (n.) Rust of metals. 3. (n.) Waste matter; any worthless matter separated from the better part; leavings; dregs; refuse. Thesaurus Entries alluvion, alluvium, ash, ashes, brand, calx, carbon, charcoal, cinder, clinker, coal, coke, coom, deposition, deposits, diluvium, draff, dregs, ember, feces, froth, fume, grounds, lava, lees, loess, moraine, offscum, precipitate, precipitation, reek, scoria, scum, sediment, settlings, silt, sinter, slag, smoke, smudge, smut, soot, sublimate, sullage |