πέτρῐνος, η, ον,
rocky, ὄρος [[ 5th c.BC: Herodotus Historicus 2.8; κοίτη 5th c.BC: Sophocles Tragicus “Philoctetes” 160 (_anapaest meter_)] Refs 5th c.BC+]; ὄχθος, δειράδες, etc., [[ 5th c.BC: Euripides Tragicus “Iphigenia Taurica” 290, 1089 (Lyric poetry), etc.; στάλα “IG” 5(1).1111.37 (from Geronthrae)] Refs 5th c.BC+]; ποτήριον [[ Anonymus Vaticanus 56 ] Refs]; λίθοι (opposed to λευκοί, 'marble') [[ “Supp.epigram” 4.446 (Didyma, 3rd c.BC)] Refs 3rd c.BC+]; π. ῥόος, τοῖχος π., [[ “Schwyzer” 89.9, 18 (Argos, 3rd c.BC)] Refs 3rd c.BC+]: metaphorically, of a person, [[ 4th c.BC: Anaxippus Comicus 3.3 (assuming variant). ] Refs 4th c.BC+]
__II changed into rock, of Niobe, [[ 12th c.AD: Tzetzes, Joannes Grammaticus “Historiarum variarum chiliades” 4.715. ] Refs]
__III π. ἀκοντισμός, a Celtic manoeuvre, [[ 2nd c.AD: Arrianus Historicus “Tactica” 37.4. ] Refs 2nd c.AD+]