ground, imp. & p. p. of Grind.
 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.

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