Definition of gantries:
(n) :
A framework of steel bars resting on side supports to bridge over or around something.
(n) :
A gantry crane or gantry scaffold.
(n) :
A supporting framework for a barrel.
(n) :
(Singapore, by extension) A faregate or turnstile controlling the entry and exit of people at a location.
(n) :
(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.