Webster's English Dictionary

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castor

cas.tor \'kas-t*r\ n [ME, fr. L, fr. Gk kasto-r, fr. Kasto-r Castor] 1: 
   BEAVER  2: a bitter strong-smelling creamy orange-brown substance 
   consisting of the  dried perineal glands of the beaver and their secretion 
   used esp. by perfumers 3: a beaver or other hat Cas.tor \'kas-t*r\ n [L, 
   fr. Gk Kasto-r] 1: the mortal twin of Pollux  2: the more northern of the 
   two bright stars in Gemini