three-lobed

from WordNet (r) 3.0 (2006)

three-lobed
    adj 1: (of a leaf shape) divided into three lobes [syn:
           {trilobate}, {trilobated}, {trilobed}, {three-lobed}]
    2: having three lobes

from The Collaborative International Dictionary of English v.0.48

Three-lobed \Three"-lobed`\, a.
   Having three lobes.
   [1913 Webster]

   {Three-lobed leaf} (Bot.), a leaf divided into three parts,
      the sinuses extending not more than half way to the
      middle, and either the parts of the sinuses being rounded.
      [1913 Webster]