amphisbaena
noun
am·phis·bae·na ˌam(p)-fəs-ˈbē-nə 
: a serpent in classical mythology having a head at each end and capable of moving in either direction
amphisbaenic
ˌam(p)-fəs-ˈbē-nik
adjective 
Example Sentences
Recent Examples on the Web My list includes epipsychidion, subaqueous, crunk, antidisestablishmentarianism, zombie, amphisbaena, floccinaucinihilipilification, dudical, enantiomorphism and Taco Bell. 
John Brownlee, WIRED, 1 Dec. 2006
John Brownlee, WIRED, 1 Dec. 2006 Word History
Etymology
Middle English amphibaena, borrowed from Latin amphisbaena, borrowed from Greek amphísbaina, from amphís "on both sides" (adverbial derivative of amphí "around, about") + -baina, a conflation of the present stem of baínein "to go, step" and the suffix -aina of animal names (as mýraina "moray eel," drákaina "she-dragon") — more at ambient entry 1, come entry 1
First Known Use
14th century, in the meaning defined above
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