The primary headword is the future indicative active, third person singular, of the compound contract verb peripoie/w, I cause to remain over and above, keep safe, preserve; see generally LSJ s.v. It must be quoted from somewhere; there are numerous possibilities (not including the quotation given here, which contains the present middle/passive participle, masculine accusative plural, of the same verb (peripoioume/nous); received texts of the passage, however, transmit periexome/nous (embracing); see Cary, pp. 238-9 and note 2 there).
[1] The gloss is the future indicative middle, third person singular, of the verb kta/omai, I procure for myself, get, acquire; see generally LSJ s.v. The headword is identically glossed in the Synagoge, Lexica Segueriana 339.21, and Photius' Lexicon (pi740 Theodoridis); and cf. generally pi 1270.
[2] Excerpted from Dionysius of Halicarnassus, Roman Antiquities 13.1.2; see already above. There the text recounts an episode during the siege, in 394 BCE, siege of Falerii (present-day Civita Castellana, Viterbo, Italy; Barrington Atlas map 42 grid C4) by Marcus Furius Camillus (ca. 446-ca.365, consular tribune in 401, dictator in 396; OCD(4) s.v. Furius Camillus, Marcus). The Roman military leader refuses a Faliscan schoolmaster's offer of his own noble pupils as hostages so as to coerce their fathers into betraying the city.
[3] In her critical apparatus Adler reports: that mss GF did not repeat the quoted participle; that ms V omitted the article tou=; and that ms F omits the attribution to Dionysius of Halicarnassus.