The following terms define Building and Machine Parts
gable end: end wall bearing a gable.
gain: notch, mortise, or groove, especially to receive hardware.
gasket: flat sheet of material used to form gas-tight joint between engine parts.
gibbet: jib or projecting arm of crane.
girder horizontal structural member that supports wall; floor joist between piers or columns; beam.
girder pocket: notch in foundation for base of girder.
grate: metal grid or frame of parallel bars, used for support, ventilation, and filtration.
grid: grate, metal openwork surface.
groove: tong, narrow, hollow cut into surface.
gusset: plywood or metal plate that joins wooden members or reinforces joints.
gutter: trough to siphon fluid, especially rainwater from root.
guy: reinforcing wire, chain.