Century Dictionary and Cyclopedia
- n. A liquid containing ammonia and ammonium carbonate and sulphid, besides other products, obtained from coal in the manufacture of illuminating gas.
“When it is subjected to dry distillation, as is done in the gas-works, the nitrogen which it contains is chiefly converted into ammonia, and, in the process of purification of the gas, is removed in the "gas-liquor,"  which contains about one per cent of ammonia.”
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