Source : Webster's Revised Unabridged Dictionary (1913)

Lucerne \Lu"cerne\, n. (Bot.)
   See {Lucern}, the plant.

Source : WordNet®

lucerne
     n : important European leguminous forage plant with trifoliate
         leaves and blue-violet flowers grown widely as a pasture
         and hay crop [syn: {alfalfa}, {Medicago sativa}]