lu·cern /luˈsɝn/
  Lu·cern, n.  Bot. A leguminous plant (Medicago sativa), having bluish purple cloverlike flowers, cultivated for fodder; -- called also alfalfa. [Written also lucerne.]
  Lu·cern, n.  A lamp. [Obs.]
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  Lu·cern n.  [Obs.]
  1. A sort of hunting dog; -- perhaps from Lucerne, in Switzerland.
  My lucerns, too, or dogs inured to hunt
  Beasts of most rapine.   --Chapman.
  2. An animal whose fur was formerly much in request (by some supposed to be the lynx). [Written also lusern and luzern.]
  The polecat, mastern, and the richskinned lucern
  I know to chase.   --Beau. & Fl.