sideritis
From LSJ
τους φίλους λόγων τέχναιν επαίδευσας → Using 2 artifices, you educated (taught) those who love rhetoric.
Latin > English (Lewis & Short)
sĭdērītis: is, f., = σιδηρῖτις.
I Ironwort, vervain, Plin. 25, 5, 19, § 42; 26, 14, 88, § 148.—
II A precious stone, Plin. 37, 10, 67, § 182. A variety of it, found in Æthiopia, is called sĭdērŏpoecĭlos, = σιδηροποίκιλος, id. 37, 10, 67, § 182.—
III The loadstone, magnet, Plin. 36, 16, 25, § 127 Jan.