/awr'neuh this"kee euhn/ , n.
1. any herbivorous dinosaur of the order Ornithischia, having a pelvis resembling that of a bird. Cf. saurischian .
adj.
2. belonging or pertaining to the Ornithischia.
[ 1900-05; Ornithischi ( a ) ( ornith- ORNITH- + -ischia ischíon ISCHIUM) + -AN ]