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sa·ber·tooth / ˈsābərˌtoō[unvoicedth]/ • n. 1. (also saber-toothed cat or saber-toothed tiger) a large extinct carnivorous mammal (genus Smilodon of the American Pleistocene and genus Machairodus of the Old World Pliocene) of the cat family, with massive, curved upper canine teeth. 2. a large extinct marsupial mammal (genus Thylacosmilus, family Borhyaenidae) with similar teeth, of the South American Pliocene.