The lexicographer is distinguishing two perfect participles, spelled differently but (at his time) pronounced the same.
[1] The headword is the masculine accusative plural perfect active participle, the gloss is the masculine accusative plural aorist active participle, both from the verb deiknumi ["I display, show"]
[2] Dedêchotas is the masculine accusative plural perfect active participle and dakontas the masculine accusative plural aorist participle, both from daknô ["I bite"]. Again at delta 146.