The Collaborative International Dictionary of English v.0.48:

Wedge-formed \Wedge"-formed`\, a.
   Having the form of a wedge; cuneiform.
   [1913 Webster]

   Wedge-formed characters, Wedge-shaped characters. See
      Arrow-headed characters, under Arrowheaded, and cf.
      cuneiform.
      [1913 Webster +PJC] wedge gauge