Webster's English Dictionary

Enter the word to look up:

rex

rex \'reks\ n or rex.es or rex [F castorrex, castorex, a variety of rabbit, 
   fr. L castor bea] pl ver + rex king - more at CASTOR, ROYAL : an animal 
   showing a genetic recessive variation in which the guard hairs  are shorter 
   than the undercoat or entirely lacking