Source : Webster's Revised Unabridged Dictionary (1913)

Amphineura \Am`phi*neu"ra\, n. pl. [NL., fr. ? + ? sinew,
   nerve.] (Zo["o]l.)
   A division of Mollusca remarkable for the bilateral symmetry
   of the organs and the arrangement of the nerves.

Source : WordNet®

Amphineura
     n : a class of Gastropoda [syn: {subclass Amphineura}]