gas water en · NOUN
Meanings
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(uncountable) Water through which gas has been passed for purification, and used for the manufacture of sal ammoniac, carbonate of ammonia, and Prussian blue.
1852-1866, Charles Tomlinson, Cyclopaedia of Useful Arts and Manufactures The tar and ammoniacal liquor or gas water are collected in the tar cistern, in which the tar occupies the lowest position.