The Collaborative International Dictionary of English v.0.48:

Wedge-shaped \Wedge"-shaped`\, a.
   1. Having the shape of a wedge; cuneiform.
      [1913 Webster]

   2. (Bot.) Broad and truncate at the summit, and tapering down
      to the base; as, a wedge-shaped leaf.
      [1913 Webster]

WordNet (r) 3.0 (2006):

wedge-shaped
    adj 1: (of a leaf shape) narrowly triangular, wider at the apex
           and tapering toward the base [syn: cuneate, wedge-
           shaped]
    2: shaped like a wedge [syn: wedge-shaped, cuneal,
       cuneiform]