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From LSJ
σιγᾶν ἄμεινον ἢ λαλεῖν ἃ μὴ πρέπει → it's better to keep silence than to say what's not appropriate (Menander)
English > Greek (Woodhouse)
subs.
P. λίθος Ἡρακλεία, ἡ (Plat., Ion, 533D), λίθος Ἡρακλεῶτις, ἡ (Plat., Ion, 535E), V. Μαγνῆτις λίθος, ἡ (Eur., Frag.), Λυδία λίθος, ἡ (Soph., Frag.).