amphisbaena
Concise Oxford English Dictionary © 2008 Oxford University Press:
amphisbaena /ˌamfɪsˈbiːnə/
▶noun a mythical serpent with a head at each end.
– origin ME: via L. from Gk amphisbaina, from amphis ‘both ways’ + bainein ‘go’.
'amphisbaena' also found in these Oxford entries:

