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A silver or bronze coin of ancient Rome equivalent to one fourth of a denarius.
[Latin sēstertius, a coin worth two and a half asses : sēmis, half; see sēmi- in Indo-European roots + tertius, third; see trei- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl sesterces or sestertii (sɛˈstɜːtɪaɪ)
(Currencies) a silver or, later, bronze coin of ancient Rome worth a quarter of a denarius
[C16: from Latin sēstertius a coin worth two and a half asses, from sēmis half + tertius a third]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
a silver coin of ancient Rome, the quarter of a denarius, equal to 2½ asses.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.