sealing-watern. water standing in the trap of a drain which prevents the escape of foul air from a sewer.
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the world > space > relative position > closed or shut condition > that which or one who closes or shuts > [noun] > that which closes an aperture > material or composition used for > water standing in a trap
sealing-water1884
seal1889
1884 Waring in Cent. Mag. Dec. 260/2 The current thus produced is to carry the sealing-water with it.