εἰ δὲ τύχῃ τις ἔρδων, μελίφρον' αἰτίαν ῥοαῖσι Μοισᾶν ἐνέβαλε → if someone is successful in his deeds, he casts a cause for sweet thoughts into the streams of the Muses
P. and V. τὸ κοῖλον,
As opposed to convexity: P. κοιλότης, ἡ (Aristotle)
