The Collaborative International Dictionary of English v.0.48:

Ptenoglossa \Pte`no*glos"sa\, n. pl. [NL., fr. Gr.? feathered +
   ? tongue.] (Zool.)
   A division of gastropod mollusks having the teeth of the
   radula arranged in long transverse rows, somewhat like the
   barbs of a feather.
   [1913 Webster]