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From Biology-Online Dictionary | Biology-Online Dictionary
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1. A fabled serpent with a head at each end, moving either way.

2. (Science: zoology) a genus of harmless lizards, serpentlike in form, without legs, and with both ends so much alike that they appear to have a head at each, and ability to move either way.

The gordius aquaticus, or hairworm, has been called an amphisbaena; but it belongs among the worms.

Origin: L, fr. Gr.; on both ends _ to go.