ballister

/B AE1 L AH0 S T ER0/
noun
  1. 1

    A brace on a brass instrument that helps hold the valves in place.

  2. 2

    (obsolete) A crossbow or ballista.

  3. 3

    Alternative form of baluster; a short pillar. [(architecture) A short column used in a group to support a rail, as commonly found on the side of a stairway or around a balcony; a banister.]