parallel bars

noun

1. (used with a plural verb) a gymnasium apparatus consisting of two wooden bars on uprights, adjustable in height, and used for swinging, vaulting, balancing exercises, etc.
2. (used with a singular or plural verb) a competitive event for men on such an apparatus.

pl n

1. gymnastics
   1. (functioning as plural)a pair of wooden bars on uprights, sometimes at different heights, for various exercises
   2. (functioning as singular)an event in a gymnastic competition in which competitors exercise on such bars