Source : Webster's Revised Unabridged Dictionary (1913)

Lupinine \Lu"pin*ine\, n. (Chem.)
   An alkaloid found in several species of lupine ({Lupinus
   luteus}, {L. albus}, etc.), and extracted as a bitter
   crystalline substance.

Source : WordNet®

Lupinus luteus
     n : yellow-flowered European lupine cultivated for forage [syn:
         {yellow lupine}]