資料來源 : Webster's Revised Unabridged Dictionary (1913)

Castor oil \Cas"tor oil\ (k[a^]s"t[~e]r oil`).
   A mild cathartic oil, expressed or extracted from the seeds
   of the {Ricinus communis}, or {Palma Christi}. When fresh the
   oil is inodorous and insipid.

   {Castor-oil plant}. Same as {Palma Christi}.

資料來源 : WordNet®

castor-oil plant
     n : large shrub of tropical Africa and Asia having large palmate
         leaves and spiny capsules containing seeds that are the
         source of castor oil and ricin; widely naturalized
         throughout the tropics [syn: {castor bean plant}, {palma
         christi}, {palma christ}, {Ricinus communis}]