#1: Balustrade
Definition:
a kind of low wall that is placed at the sides of staircases, bridges, etc., and that is made of a row of short posts topped by a long rail
About the Word:
Both balustrade and baluster (which refers to the one of the vertical supports of a balustrade) come from the Italian word for the flower of the wild pomegranate, whose vaselike shape perhaps resembles that of some balusters.