The Collaborative International Dictionary of English v.0.48:

Balustrade \Bal"us*trade`\ (-tr[=a]d`), n. [F. balustrade, It.
   balaustrata fr. balaustro. See Baluster.] (Arch.)
   A row of balusters topped by a rail, serving as an open
   parapet, as along the edge of a balcony, terrace, bridge, or
   the eaves of a building, or as a guard railing on a
   staircase; -- it serves as a guard to prevent people from
   falling.

   Syn: bannister, banister, balusters, handrail, guard rail.
        [1913 Webster +PJC]

WordNet (r) 3.0 (2006):

balustrade
    n 1: a railing at the side of a staircase or balcony to prevent
         people from falling [syn: bannister, banister,
         balustrade, balusters, handrail]

Moby Thesaurus II by Grady Ward, 1.0:

54 Moby Thesaurus words for "balustrade":
   Samson post, baluster, banister, barrier, base, boundary, caryatid,
   colonnade, column, dado, die, doorjamb, doorpost, fence, footstalk,
   gatepost, hitching post, jack, jamb, king post, milepost, mullion,
   newel-post, pedestal, pedicel, peduncle, pier, pilaster, pile,
   piling, pillar, plinth, pole, post, queen-post, rail, railing,
   shaft, signpost, snubbing post, socle, staff, stalk, stanchion,
   stand, standard, stem, stile, stone wall, subbase, surbase, trunk,
   upright, wall