The primary headword is the present active participle, masculine nominative singular, of the verb saro/w. It is presumably quoted from somewhere.
[1] cf. zeta 9, kappa 2076, kappa 2078, nu 228.
[2] (This addendum to the entry is lacking, Adler reports, in mss AFV but written in the margin of A by a later hand.) For the substantive glossing cf. John Philoponus, On words which have different meanings when differently accented sigma1 (recensions ADE), sigma2 (recension C), sigma11 (recension B); also Hesychius sigma235 (and sigma236 for a different sense). The syntactical point is paralleled, according to Adler, in the Lexicon Syntacticum of Codex Laurentianus 59.16, and Anecdota Graeca (Cramer) 4.299.14.