The Collaborative International Dictionary of English v.0.48:

Rypophagous \Ry*poph"a*gous\ (r[-i]*p[o^]f"[.a]*g[u^]s), a. [Gr.
   "ry`pos filth + fagei^n to eat.] (Zool.)
   Eating, or subsisting on, filth.
   [1913 Webster]