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The Collaborative International Dictionary
Gordius aquaticus

Amphisbaena \Am`phis*b[ae]"na\, n. [L., fr. Gr. ?; ? on both ends + ? to go.]

  1. A fabled serpent with a head at each end, moving either way.
    --Milton.

  2. (Zo["o]l.) 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. See Illustration in Appendix.

    Note: The Gordius aquaticus, or hairworm, has been called an amphisb[ae]na; but it belongs among the worms. [1913 Webster] ||