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Term Definition
Geometry. A branch of mathematics that deals with the measurement, properties, and relationships of points, lines, surfaces, and solids.  
Geotechnical Engineer. An engineer who specializes in rock and soil mechanics, groundwater, and foundations.  
Geotechnical Investigation. The process of boring, sampling, and testing the soil at various depths to enable the geotechnical engineer to discover and analyze characteristics of the soil; also called Subsurface Investigation, Foundation Investigation, Soil Investigation, or Soil Test; the test results and engineers recommendations are explained and summarized in a Soil Report.  
Geotextile. synthetic fabrics used to separate backfill materials for proper drainage; used in high retaining walls and landscape design.  
Gesso. A plaster surface composed of gypsum plaster, whiting, and glue, used as a base for decorative painting.  
GFI Breaker. Ground Fault Interrupter Breaker; supplies power, as any breaker does, but also monitors the amount of incoming and outgoing current; whenever the entering current does not equal the leaving current, indicating current leakage, the GFI instantly opens the circuit; a faster overcurrent protection device than either a fuse or circuit breaker.  
GFRC. Glass-Fiber-Reinforced Concrete.  
Ghosting. In painting, patches of lighter color showing in dry coat; a coating with a skippy appearance.  
GI. Galvanized Iron.  
Gild. To apply a thin covering of gold.  
Gilding. Process of obtaining a finish by using metal leaf.  
Gillmore Needle. A device used in determining time of setting of hydraulic cement.  
Gilsonite. A black, coal-like substance obtained from mines and used in the manufacture of black asphaltum varnish.  
Gin Pole. A simple derrick consisting of a pole held nearly vertical by guy cables, a pulley at the top of the pole, and a hoisting rope.  
Girder. A beam that supports other beams; a very large beam, especially one that is built up from smaller elements; a timber beam used to support wall beams or joists.  
Girt. A beam that supports wall cladding between columns.  
Gland. A device for preventing leakage of fluid past a joint in machinery, as at a bearing.  
Glare. Excessive brightness in the field of view.  
Glass Bead. A narrow strip of plastic, metal, or wood used to hold glass in a sash; removable trim that holds glass in place.  
Glass Block. A hollow masonry unit made of glass.  
Glass Cutter. A tool for cutting glass.  
Glass Door. A metal or wood framed door manufactured with heat-strengthened or tempered glass.  
Glass Felt. A felt sheet in which glass fibers are bonded into the felt sheet with resin; they are suitable for impregnation and coating; used in the manufacture and coating of bituminous waterproofing materials, roof membranes, and shingles.  
Glass Fiber. Glass in the form of fine fibers used in fabrics.  
Glass Mat. A thin mat of glass fibers with or without a binder.  
Glass Mosaic Tiles. Tiles made of glass, usually in sizes not over two inches square and 1/4 inch thick, mounted on sheets of paper, usually twelve inches square.  
Glass Mullion System. A method of constructing a large glazed area by stiffening the sheets of glass with perpendicular glass ribs.  
Glass Pipe. Glass and glass-lined pipe used in process piping and in laboratories.  
Glass Tempering Association (GTA). White Lakes Professional Building, 3310 SW Harrison, Topeka, Kansas 66611, (913) 266-7064.  
Glass Wool. Glass in the form of fine fibers used in insulation.  

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