Ground joint

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a close joint made by grinding together two pieces, as of metal with emery and oil, or of glass with fine sand and water.

See also: ground

References in periodicals archive ?
The Common Ground Joint Capability Technology Demonstration is bigger than just improved geospatial reasoning, but seeks to improve interoperability vertically and horizontally across the Department of Defense, supporting government agencies, and allies.
FAC(A)s view the battlefield from the same vantage as the CAS aircraft they control: a decidedly macrolevel, two-dimensional, "bird's-eye" view (in contrast to the three-dimensional view of the ground joint terminal attack controller [JTAC], which is dominated by a limited horizon, vertical development, and microterrain).
Ground Joint Union--three-part fitting that connects any standard size pipe where it may be necessary to disconnect later.
As part of their training, US Navy forward air controllers (airborne) (FAC[A]) crews earn qualifications as ground joint terminal attack controllers (JTAC).