στιππεῖον
From LSJ
περὶ οὐδὲν γὰρ οὕτως ὑπάρχει τῶν ἀνθρωπίνων ἔργων βεβαιότης ὡς περὶ τὰς ἐνεργείας τὰς κατ' ἀρετήν → since none of man's functions possess the quality of permanence so fully as the activities in conformity with virtue
English (LSJ)
τό,= στυππεῖον, PRyl.245.14 (iii A.D.); also στιππῖον, PSI5.469.12,19 (iv A.D.).