The headword is perfect active participle of katagoreu/w, apparently masculine accusative singular. Same glossing in other lexica; see the references in Photius kappa462 Theodoridis. It must be quoted from somewhere, perhaps from its only extant occurrence outside lexica (Cyril of Alexandria, Against Julian, prologue 5).
cf. kappa 509 (and, for headword and gloss reversed, kappa 1034 and kappa 1035).