The Collaborative International Dictionary of English v.0.48:

cardamon \cardamon\ n.
   same as cardamom.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

cardamon
    n 1: rhizomatous herb of India having aromatic seeds used as
         seasoning [syn: cardamom, cardamon, Elettaria
         cardamomum]
    2: aromatic seeds used as seasoning like cinnamon and cloves
       especially in pickles and barbecue sauces [syn: cardamom,
       cardamon, cardamum]