Ask at the forum if you have an Ancient or Modern Greek query!
later form for ἔρευνα, POxy.67.18 (iv A. D.), Ph.1.485 (Pap.):—also ἐραυνάω LXX 1 Ch.19.3 (v.l.), 1 Ep.Cor.2.10,al., POxy. 294.9 (i A. D., Pass.), Ph.1.484 (Pap.):