The Collaborative International Dictionary of English v.0.48:

Anethum \Anethum\ n.
   a genus of plants of the parsley family having aromatic seeds
   and finely divided leaves, including the dill Anethum
   graveolens.

   Syn: genus Anethum.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Anethum
    n 1: dill [syn: Anethum, genus Anethum]