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Cellular slaggy lava; volcanic cinders.

urs the plain. Pope. Scouring barrel, a tumbling barrel. See under Tumbling. -- Scouring cinder (Metal.), a basic slag, which attacks the lining of a shaft furnace. Raymond. -- Scouring rush. (Bot.) See Dutch rush, under Dutch. -- Scouring stock (Woolen Manuf.), a kind of fulling mill.

The dross, or recrement, of a metal; also, vitrified cinders.

instead of passing through the part and receiving a nut. See Illust. under Bolt. -- Tap cinder (Metal.), the slag of a puddling furnace.

A white to gray volcanic tufa, formed of decomposed trachytic cinders; -- sometimes used as a cement. Hence, a coarse sort of plaster or mortar, durable in water, and used to line cisterns and other reservoirs of water. [Formerly written also tarras, tarrace, terras.]

A friable volcanic rock or conglomerate, formed of consolidated cinders, or scoria.

olten lava having a rounded form. -- Volcanic cone, a hill, conical in form, built up of cinders, tufa, or lava, during volcanic eruptions. -- Volcanic foci, the subterranean centers of volcanic action; the points beneath volcanoes where the causes producing volcanic phenomena are most active. -- Volcanic glass, the…

A mountain or hill, usually more or less conical in form, from which lava, cinders, steam, sulphur gases, and the like, are ejected; -- often popularly called a burning mountain.