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The hypothetical radical SO, regarded as an essential constituent of certain sulphurous compounds; as, thionyl chloride.

signating, an unstable acid, H2S2O3, analogous to sulphuric acid, and formerly called hyposulphurous acid.

ed acid charged with nitrous fumes. These fumes, as a catalytic, effect the conversion of sulphurous to sulphuric acid. See Sulphuric acid, under Sulphuric, and Gay Lussac's tower, above. -- Round tower. See under Round, a. -- Shot tower. See under Shot. -- Tower bastion (Fort.), a bastion of masonry, often with cha…

a knot. Sacharissa's captive fain Would untie his iron chain. Waller. Her snakes untied, sulphurous waters drink. Pope.

orm of lava, produced by sudden cooling; obsidian. See Obsidian. -- Volcanic mud, fetid, sulphurous mud discharged by a volcano. -- Volcanic rocks, rocks which have been produced from the discharges of volcanic matter, as the various kinds of basalt, trachyte, scoria, obsidian, etc., whether compact, scoriaceous, or…