The primary headword, evidently extracted from somewhere, is the aorist active participle, masculine nominative (and vocative) singular, of the contract verb fwra/w, I search after a thief, detect, discover; cf. phi 663, phi 664, and see generally LSJ s.v.
[1] The glossing participles are the same form as the headword, but from the verbs diereuna/w, I track down and katalamba/nw, I seize, lay hold of; see generally LSJ s.vv. The headword is identically glossed in the Synagoge and Photius' Lexicon (Adler also cites Etymologicum Genuinum), and similarly in Etymologicum Magnum 804.10 (Kallierges) and ps.-Zonaras 1838.18; cf. a scholion (4.10 (Rabe) to Lucian's Phalaris.
[2] This secondary headword (future indicative and aorist subjunctive active, first person singular, of the headword verb) occurs at Aristophanes, Frogs 1363 (web address 1), among lines where Aeschylus lampoons Euripides by reading alleged verse of the latter in which a slave girl's quarters must be searched for a stolen rooster; the glosses follow the scholia thereto. Athenian law specified conditions under which one might search (fwra=n; cf. phi 664) another's house for stolen goods (Dover, p. 365).
[3] This tertiary headword -- an instance of which occurs at lambda 685 (end) -- is the aorist active infinitive of the headword verb.