Having or characterized by more than two incisor teeth in the lower jaw; esp. designating the mainly carnivorous and insectivorous marsupials so…

Having molar teeth with three conical cusps, as the extinct genus Triconodon or family Triconodontidæ of mammals (supposed to be marsupials); also…

(a) adj. belonging to or having the characters of this family; (b) n. = triconodontid n.

= polyprotodont, adj.