Otozoum

from The Century Dictionary.

• noun The generic name applied to the footprints of a gigantic extinct dinosaurian reptile that usually walked erect on its hind legs with a stride a yard long. These tracks are found in the red Newark sandstones of the Connecticut valley, twenty-four such consecutive imprints having been exposed in one of the quarries at Portland, Connecticut.

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

• proper noun (Paleon.) An extinct genus of huge vertebrates, probably dinosaurs, known only from four-toed tracks in Triassic sandstones.