amblypoda

from The Century Dictionary.

• A suborder of Eocene mammals belonging to the Subungulata, or many-toed hoofed quadrupeds, of elephantine proportions and structure of the limbs.

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

• noun plural (Paleon.) A group of large, extinct, herbivorous mammals, common in the Tertiary formation of the United States.