The scum formed by oxidation at the surface of molten metals.

synonyms: dross, scoria.

Roget 384: increase of temperature; heating etc. v.; calefaction^†, tepefaction^†, torrefaction^†; melting, fusion; liquefaction etc. 335; burning etc. v.; ambustion^†, combustion; incension^†, accension^†; concremation^†, cremation; scorification^†; cautery, cauterization; ustulation^†, calcination; cracking, refining; incineration, cineration^†; carbonization; cupellation [Chem].    ignition, inflammation, adustion^†, flagration^†; deflagration, conflagration; empyrosis^†, incendiarism; arson; auto dafe [Fr.].    boiling etc. v.; coction^†, ebullition, estuation^†, elixation^†, decoction; ebullioscope^†; geyser; distillation (vaporization) 336.    furnace etc. 386; blanket, flannel, fur; wadding etc. (lining) 224; clothing etc. 225.    still; refinery; fractionating column, fractionating tower, cracking tower.    match etc. (fuel) 388; incendiary; petroleuse [Fr.]; [biological effects resembling the effects of heat] [substances causing a burning sensation and damage on skin or tissue] cauterizer^†; caustic, lunar caustic, alkali, apozem^†, moxa^†; acid, aqua fortis [Lat.], aqua regia; catheretic^†, nitric acid, nitrochloro-hydric acid, nitromuriatic acid; radioactivity, gamma rays, alpha particles, beta rays, X-rays, radiation, cosmic radiation, background radiation, radioactive isotopes, tritium, uranium, plutonium, radon, radium.    sunstroke, coup de soleil [Fr.]; insolation.    [artifacts requiring heat in their manufacture] pottery, ceramics, crockery, porcelain, china; earthenware, stoneware; pot, mug, terra cotta [Sp.], brick, clinker.    [products of combustion] cinder, ash, scoriae, embers, soot; slag.    [products of heating organic materials] coke, carbon, charcoal; wood alcohol, turpentine, tea tree oil; gasoline, kerosene, naptha, fuel oil (fuel) 388; wax, paraffin; residue, tar.    inflammability, combustibility.    [Transmission of heat] diathermancy^†, transcalency^†, conduction; convection; radiation, radiant heat; heat conductivity, conductivity.    [effects of heat 2] thermal expansion; coefficient of expansion.    ... show more

Roget 653: uncleanness etc. adj.; impurity; immundity^†, immundicity^†; impurity etc. 961 [of mind]. defilement, contamination etc. v.; defoedation^†; soilure^†, soiliness^†; abomination; leaven; taint, tainture^†; fetor etc. 401^†.    decay; putrescence, putrefaction; corruption; mold, must, mildew, dry rot, mucor, rubigo^†.    slovenry^†; slovenliness etc. adj.; squalor.    dowdy, drab, slut, malkin^†, slattern, sloven, slammerkin^†, slammock^†, slummock^†, scrub, draggle-tail, mudlark^†, dust-man, sweep; beast.    dirt, filth, soil, slop; dust, cobweb, flue; smoke, soot, smudge, smut, grit, grime, raff^†; sossle^†, sozzle^†.    sordes^†, dregs, grounds, lees; argol^†; sediment, settlement heeltap^†; dross, drossiness^†; mother^†, precipitate, scoriae, ashes, cinders.    recrement^†, slag; scum, froth.    hogwash; ditchwater^†, dishwater, bilgewater^†; rinsings, cheeseparings; sweepings etc. (useless refuse) 645; offscourings^†, outscourings^†; off scum; caput mortuum [Lat.], residuum, sprue, fecula [Lat.], clinker, draff^†; scurf, scurfiness^†; exuviae [Lat.], morphea; fur, furfur^†; dandruff, tartar.    riffraff; vermin, louse, flea, bug, chinch^†.    mud, mire, quagmire, alluvium, silt, sludge, slime, slush, slosh, sposh [U.S.].    spawn, offal, gurry [U.S.]; lientery^†; garbage, carrion; excreta etc. 299; slough, peccant humor, pus, matter, suppuration, lienteria^†; faeces, feces, excrement, ordure, dung, crap [Vulg.], shit [Vulg.]; sewage, sewerage; muck; coprolite; guano, manure, compost.    dunghill, colluvies^†, mixen^†, midden, bog, laystall^†, sink, privy, jakes; toilet, john, head; cess^†, cesspool; sump, sough, cloaca, latrines, drain, sewer, common sewer; Cloacina; dust hole.    sty, pigsty, lair, den, Augean stable^†, sink of corruption; slum, rookery.    ... show more

Dutch: del, metaalslak, slak, slakken
Polish: żużel

Convert into slag.