The Collaborative International Dictionary of English v.0.48:

Gantry \Gan"try\, n.
   See Gauntree.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gantry
    n 1: a framework of steel bars raised on side supports to bridge
         over or around something; can display railway signals above
         several tracks or can support a traveling crane etc. [syn:
         gantry, gauntry]