The headword, evidently quoted from somewhere, is a masculine noun in the genitive singular; see LSJ s.v. o)/xlos, -ou, o(, and cf. omicron 1056 (for headword and gloss), omicron 1058.
[1] The first gloss is the genitive singular form of the feminine noun a)gana/kthsis, -ews, h( (irritation, disorder); see LSJ s.v. The second gloss is the same form of the substantive taraxh/, -h=s, h( (trouble, disorder, confusion); see LSJ s.v.
[2] Quotation (and individual) unidentifiable. [In her critical apparatus Adler reports that ms V transmits e)pe/qeto.]
[3] Polybius 3.80.3 (web address 1); cf. delta 413. The popular leader Gaius Flaminius (d. 217 BCE; OCD(4) s.v. Flaminius(1) and phi 517) was re-elected consul in 217, but was killed along with some 15,000 of his men in an ambush orchestrated by Hannibal (OCD(4) s.v; alpha 2452; and Walbank, 410-20) during the Second Punic War (218-202) at Lake Trasimene, present-day Italy's Lago Trasimeno (Barrington Atlas map 42 grid C2, cf. alpha 3856 and lambda 383).
[4] Polybius fr. 188 Büttner-Wobst. Büttner-Wobst notes (539) that Casaubon attributed this fragment to Polybius. Within Polybius' Histories this fragment is unplaced, and Schweighäuser was reluctant to attribute it to Polybius (ibid.). Indeed, the text has also been claimed as Damascius, Life of Isidore fr. 241 Zintzen (143 Asmus, 97D Athanassiadi), where Isidore apparently forbids questioning the philosopher Marinos (Marinus, d. ca. 500 CE), who in 485 succeeded Proclus (cf. pi 2473) as head of the Academy in Athens; cf. mu 198, mu 199, alpha 157, theta 78, and PLRE II s.v. Marinus 3.