The headword, evidently quoted from somewhere, is a rare perfect active participle (in the masculine nominative plural) of ἡσσάω , which usually occurs only in the middle/passive; the gloss is the Attic aorist active participle of the same verb.
cf. Diodorus Siculus 15.87.3, which has the Attic version of the headword, ἡττηκότες (web address 1).