[1] : The Collaborative International Dictionary of English v.0.48

baluster \bal"uster\, n. f. balustre, it. balaustro, fr. l.
   balaustium the flower of the wild pomegranate, fr. gr.
   balay`stion; -- so named from the similarity of form.
   arch.
   a small column or pilaster, used as a support to the rail of
   an open parapet, to guard the side of a staircase, or the
   front of a gallery. see balustrade. corrupted into
   banister.
   1913 webster
see also:
balustrade banister 

[2] : WordNet (r) 2.0

baluster
     n : one of a number of closely spaced supports for a railing

Baluster >> B Words
Baluster, definition of term: Baluster
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