[1] : The Collaborative International Dictionary of English v.0.48

castor oil \cas"tor oil\ ka^s"t~er 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.
   1913 webster

   castor-oil plant. same as palma christi.
      1913 webster
see also:
ricinus communis palma christi castor-oil plant 

[2] : WordNet (r) 2.0

castor oil
     n : a purgative extracted from the seed of the castor plant;
         used in paint and varnish as well as medically

Castor Oil >> C Words
Castor Oil, definition of term: Castor Oil
castor+oil_pag1.html

Castor >> C Words
Castor, definition of term: Castor
castor_pag1.html

Coconut Oil >> C Words
Coconut Oil, definition of term: Coconut Oil
coconut+oil_pag1.html

Cod Oil >> C Words
Cod Oil, definition of term: Cod Oil
cod+oil_pag1.html

Banana Oil >> B Words
Banana Oil, definition of term: Banana Oil
banana+oil_pag1.html

Baby Oil >> B Words
Baby Oil, definition of term: Baby Oil
baby+oil_pag1.html

Cod-Liver Oil >> C Words
Cod-Liver Oil, definition of term: Cod-Liver Oil
cod-liver+oil_pag1.html

Camphor Oil >> C Words
Camphor Oil, definition of term: Camphor Oil
camphor+oil_pag1.html

Castor And Poll >> C Words
Castor And Poll, definition of term: Castor And Poll
castor+and+poll_pag1.html