The Collaborative International Dictionary of English v.0.48:

glassblower \glass"blow*er\, glass blower \glass" blow*er\n.
   1. someone skilled creating objects such as bottles, vases,
      or other decorative or practical items from molten glass,
      especially one whose occupation is to make objects by
      blowing and shaping hot glass in its viscous semiliquid
      state.
      [WordNet 1.5 +PJC] glassblowing

WordNet (r) 3.0 (2006):

glassblower
    n 1: someone skilled in blowing bottles from molten glass