Balancer \Bal"an*cer\, n.
   1. One who balances, or uses a balance.
      [1913 Webster]

   2. (Zool.) In Diptera, the rudimentary posterior wing.
      [1913 Webster]

	

	balancer
    n 1: an acrobat who balances himself in difficult positions
    2: either of the rudimentary hind wings of dipterous insects;
       used for maintaining equilibrium during flight [syn:
       halter, haltere, balancer]