Dĭ'no-thēre or Dĭ'no-thē'rē-ŭm, n.

noun

n. [Gr. δεινός, terrible, and θηρίον, beast.] (Zoöl.) An extinct animal of gigantic size, whose remains occur in the middle tertiary. It is remarkable for having two large, elephant-like tusks set in its lower jaw.

An engraved illustration of a large, elephant-like animal with a long, downward-curving trunk and prominent tusks, seated on the ground. — Dinotherium Giganteum.