Di'no·thereDi`no*the'ri*um noun [ New Latin dinotherium , from Greek deino`s terrible + qhri`on beast.] (Paleon.) A large extinct proboscidean mammal from the miocene beds of Europe and Asia. It is remarkable fora pair of tusks directed downward from... Found on http://www.encyclo.co.uk/webster/D/69
any elephantlike mammal of the extinct genus Dinotherium, from the later Tertiary Period of Europe and Asia, having large, outwardly curving tusks. Found on https://www.infoplease.com/dictionary/dinothere
• (n.) Alt. of Dinotherium
Di'no·there 
any elephantlike mammal of the extinct genus Dinotherium, from the later Tertiary Period of Europe and Asia, having large, outwardly curving tusks.