Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Noun: ornithorhynchus anatinus Your choice? derived from the Byzantine Church and adhering to Byzantine rites the branch of surgery concerned with disorders or deformities of the spine and joints small densely furred aquatic monotreme of Australia and Tasmania having a broad bill and tail and webbed feet; only species in the family Ornithorhynchidae a completely straight ovule with the micropyle at the apex   (Noun: orthotropous ovule)