any of several extinct members of the cat family Felidae from the Oligocene to Pleistocene Epochs, having greatly elongated, saberlike upper canine teeth.
sa·ber-toothed tiger (sā'bər-tōōtht') n. Any of various extinct cats of the Oligocene to the Pleistocene Epoch, especially one of the larger members of the genus Smilodon, characterized by long upper canine teeth.