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.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.