Webster's English Dictionary

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gantry

gan.try \'gan-tre-\ n [perh. modif. of ONF gantier, fr. L cantherius 
   trellis] 1: a frame for supporting barrels  2a: a platform made to carry a 
   traveling crane and supported by towers or s ide frames running on parallel 
   tracks; also : a movable structure with platforms at different levels used 
   for erecting and servicing rockets before launching 2b: a structure 
   spanning several railroad tracks and displaying signals for  each