[1] The headword is masculine/feminine nominative plural of this adjective, presumably quoted from somewhere. For the sense, LSJ s.v. cite the phrase a)ghla/tw| ma/stigi (i.e. a purifying lightning-strike) in Lycophron, Alexandra 436.
[2] And differently accented, as if from a contracted verb a)ghlatou=n; but LSJ has only a)ghlatei=n.
[3] Textual corruption here: a (plural) noun amidst (singular) verbs. Perhaps it has been carelessly repeated from the first part of the entry.