The Collaborative International Dictionary of English v.0.48:

Boaster \Boast"er\, n.
   One who boasts; a braggart.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Boaster \Boast"er\, n.
   A stone mason's broad-faced chisel.
   [1913 Webster]

WordNet (r) 3.0 (2006):

boaster
    n 1: a very boastful and talkative person [syn: bragger,
         braggart, boaster, blowhard, line-shooter,
         vaunter]