Source : WordNet®

amphisbaena
     n 1: (classical mythology) a serpent with a head at each end of
          its body
     2: type genus of the Amphisbaenidae [syn: {genus Amphisbaena},
        {Amphisbaenia}, {genus Amphisbaenia}]
     [also: {amphisbaenae} (pl)]

amphisbaenae
     See {amphisbaena}