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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]