The headword is the perfect active participle, either masculine accusative singular or neuter nominative/accusative plural, of the verb diaspaqa/w. Evidently quoted from somewhere, it occurs in this precise form here only, but cf. diespaqiko/ta: dierrifo/ta in Photius, Lexicon delta555.
For the present infinitive see Hesychius delta1325, with the gloss a)selgw=s a)nali/skein; cf. Plutarch, Cicero 27.6 (polla\ th=s ou)si/as diaspaqh/sas).
The form diaspaqi/zw is attested in Johannes Laurentius Lydus, De magistratibus populi Romani 2.19 (passive at 1.36).
cf. also epsilon 3177.