[1] The headword -- extracted from the quotation given -- is present participle, (masculine and) neuter genitive singular, of pla/zw (i.e. LSJ's pla/zw (A)). For the glossing cf. generally Hesychius s.v. pla/zon, a scholion on Homer, Iliad 21.269 (where pla/ze occurs with the epsilon elided), and Apollonius' Homeric Lexicon (132.6).
[2] Quotation not identified by Adler but it is Josephus, Jewish War 6.398 (here with word-order reversed, see web address 1); see on this Theodoridis' edn. of Photius, II. p.LXXXVI.