Definition from Wiktionary, the free dictionary
Alternative forms 
gantry (plural gantries)
- A framework of steel bars resting on side supports to bridge over or around something.
- A supporting framework for a barrel.
- (astronautics) A gantry crane or gantry scaffold.
- (medical imaging) A cylindrical scanner assembly in the bore of which the response of bodies or tissues to some specific exposure can be detected for 3D imaging.
framework of steel bars bridging over something
astronautics — see gantry scaffold