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See 3d Trone, 2. [Obs. or Scott.]

A native double salt, consisting of a combination of neutral and acid sodium carbonate, Na2CO3.2HNaCO3.2H2O, occurring as a white crystalline fibrous deposit from certain soda brine springs and lakes; -- called also urao, and by the ancients nitrum.

A toll or duty paid for weighing wool; also, the act of weighing wool. [Obs.] Nares.

An officer in London whose duty was to weigh wool. [Obs.]

A throne. [Obs.] Chaucer.

xtremities, and supported by a wooden pillar. It is now mostly disused. [Scot.] Jamieson. Trone stone, a weight equivalent to nineteen and a half pounds. [Scot.] -- Trone weight, a weight formerly used in Scotland, in which a pound varied from 21 to 28 ounces avoirdupois.

ndustries. Called also sal soda, washing soda, or soda. Cf. Sodium bicarbonate, above and Trona. Sodium chloride, common, or table, salt, NaCl. -- Sodium hydroxide, a white opaque brittle solid, NaOH, having a fibrous structure, produced by the action of quicklime, or of calcium hydrate (milk of lime), on sodium carbo…

See Trona.