[1139] ῥόμβῳ: ῥόμβος τροχίσκος, ὃν στρέφουσιν ἱμᾶσιν τύπτοντες, καὶ οὕτως κτύπον ἀποτελοῦσιν. Schol. It was also called ῥύμβος and ῥόπτρον, cf. Plut. Crass. 23, ῥόπτρα βυρσοπαγῆ καὶ κοῖλα περιτείναντες ἠχείοις χαλκοῖς.
τυπάνῳ: the typanum or tympanum was of two kinds, the first like our tambourine with bells, the second like a kettle-drum; v. Ellis on Cat. 63. 9, Sandys on Eur. Bacch. 59.