שְׁלִישִׁי
From LSJ
τους φίλους λόγων τέχναιν επαίδευσας → Using 2 artifices, you educated (taught) those who love rhetoric.
English (Strong)
ordinal from שָׁלוֹשׁ; third; feminine a third (part); by extension, a third (day, year or time); specifically, a third-story cell): third (part, rank, time), three (years old).