The Collaborative International Dictionary of English v.0.48:

Poephaga \Po*eph"a*ga\, n. pl. [NL., fr. Gr. pohfa`gos grass
   eating; po`a grass + fagei^n to eat.] (Zool.)
   A group of herbivorous marsupials including the kangaroos and
   their allies. -- Po*eph"a*gous, a.
   [1913 Webster]