ἀστερίτης
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
(sc. λίθος), ὁ, name of a mythical precious stone, Ptol.Heph. ap. Phot. p.153B., Ps.-Democr.Alch.p.50B.
Spanish (DGE)
-ου, ὁ n. de una piedra preciosa legendaria, Ptol.Chenn.7.19, Ps.Democr.p.50, Isid.Etym.16.10.3.
Greek (Liddell-Scott)
ἀστερίτης: ὁ, λίθος τις εὑρισκόμενος, καθ’ ἃ λέγεται, ἐντὸς θαλασσίου κητώδους ἰχθύος, «ὃν (τὸν ἀστερίαν) εἰς ἥλιον τεθέντα ἀνάπτεσθαι, ποιεῖν δὲ καὶ πρὸς φίλτρον» Φωτ. Βιβλιοθ. κῶδ. 190. σ. 153, 23.