The Collaborative International Dictionary
Rhizophagous
Rhizophagous \Rhi*zoph"a*gous\, a. [Gr. ???; ??? a root + ??? to eat.] Feeding on roots; root-eating.
Douglas Harper's Etymology Dictionary
rhizophagous
1831, from comb. form of Greek rhiza "root" (see rhizome) + -phagous.