The Collaborative International Dictionary of English v.0.48:

Bilbo \Bil"bo\, n.; pl. Bilboes.
   1. A rapier; a sword; so named from Bilbao, in Spain. --Shak.
      [1913 Webster]

   2. pl. A long bar or bolt of iron with sliding shackles, and
      a lock at the end, to confine the feet of prisoners or
      offenders, esp. on board of ships.
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            Methought I lay
            Worse than the mutines in the bilboes. --Shak.
      [1913 Webster]