The Collaborative International Dictionary of English v.0.48:

Girdler \Gir"dler\, n.
   1. One who girdles.
      [1913 Webster]

   2. A maker of girdles.
      [1913 Webster]

   3. (Zool.) An American longicorn beetle (Oncideres
      cingulatus) which lays its eggs in the twigs of the
      hickory, and then girdles each branch by gnawing a groove
      around it, thus killing it to provide suitable food for
      the larv[ae].
      [1913 Webster]