The definition of a gantry is a frame or a framework, often used as a platform.(noun)
An example of a gantry is a bridge-like structure over train tracks.
See gantry in Webster's New World College Dictionary
noun pl. gantries
Origin: ME gauntre, altered (prob. infl. by tre, tree) < OFr gantier, chantier < L canterius, beast of burden, trellis < Gr kanthēlios, a pack ass
See gantry in American Heritage Dictionary 4
noun pl. gan·tries
Origin: Middle English ganter, gauntre, wooden stand for barrels
Origin: , from Old North French gantier, wooden frame
Origin: , from Latin canthērius
Origin: , from Greek kanthēlios, pack ass
Origin: , from kanthēlia, panniers at the side of a pack-saddle.
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