amphisbaena

noun, plural am·phis·bae·nae [am-fuh s-bee-nee] /ˌæm fəsˈbi ni/, am·phis·bae·nas.

1. any of numerous worm lizards of the genus Amphisbaena.
2. Classical Mythology. a serpent having a head at each end of its body and the ability to move forward or backward.

noun plural -nae (-niː) or -nas

1. any worm lizard of the genus Amphisbaena
2. classical myth a poisonous serpent having a head at each end and able to move forwards or backwards