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 for Ground joint
From The Collaborative International Dictionary of English v.0.48 :

  ground \ground\,
     imp. & p. p. of Grind.
     [1913 Webster]
     ground cock, a cock, the plug of which is ground into its
        seat, as distinguished from a compression cock. --Knight.
     Ground glass, glass the transparency of which has been
        destroyed by having its surface roughened by grinding.
     Ground joint, a close joint made by grinding together two
        pieces, as of metal with emery and oil, or of glass with
        fine sand and water.
        [1913 Webster]

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