multituberculate
noun
mul·ti·tu·ber·cu·late
| \ ˌməl-tē-ˌtü-ˈbər-kyə-lət
\
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Definition of multituberculate
: any of an order (Multituberculata) of relatively small extinct mammals of the Mesozoic and early Cenozoic that typically resembled rodents, had many-cusped molars, and have no known living descendants
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