- Architecture. any of a number of closely spaced supports for a railing.
- balusters, a balustrade.
- any of various symmetrical supports, as furniture legs or spindles, tending to swell toward the bottom or top.
- any of a set of posts supporting a rail or coping
- (of a shape) swelling at the base and rising in a concave curve to a narrow stem or necka baluster goblet stem
“support for a railing,” c.1600, from French balustre, from Italian balaustro “pillar,” from balausta “flower of the wild pomegranate,” from Greek balaustion (perhaps of Semitic origin, cf. Aramaic balatz “flower of the wild pomegranate”). Staircase uprights had lyre-like double curves, like the calyx tube of the pomegranate flower.