Same or similar entry in other lexica and scholia; see the references at Photius kappa616 Theodoridis. The headword -- present participle, masculine nominative singular, of the verb kertome/w -- occurs in, and might therefore be quoted from, Sophocles, Philoctetes 1235 (web address 1): "By the gods, is it to taunt me that you say these things?"
See also kappa 1422, kappa 1423, which share glosses with this entry.