שְׁלִישִׁי

From LSJ

τους φίλους λόγων τέχναιν επαίδευσας → Using 2 artifices, you educated (taught) those who love rhetoric.

Source

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).