ˈse(ˌ)stərs noun
( -s )
Etymology: Latin sestertius, from sestertius two and a half times as great (from its being equal originally to two and a half asses), from semis a half (from semi- ) + tertius third — more at semi- , third
1.
a. : an ancient Roman coin equal to 1/4 denarius
b. : a corresponding unit of value
2. : sestertium