orthopoda

from The Century Dictionary.

• An ordinal term introduced by Cope for a division of the dinosaurian reptiles otherwise known as the Predentata (which see).

from the GNU version of the Collaborative International Dictionary of English.

• proper noun plural (Zoöl.) An extinct order of reptiles which stood erect on the hind legs, and resembled birds in the structure of the feet, pelvis, and other parts.