[1] = Synagoge sigma398 and Photius, Lexicon sigma856, where Theodoridis (following Adler) declares the headword (present active participle, masculine plural nominative, of sfakeli/zw) to be quoted from Deuteronomy 28:32 LXX (concerning eyes). (Less likely to be from Theophrastus, Enquiry into Plants 8.6.5, the only other literary attestation of this form.) See also, post-Suda, Etymologicum Magnum 736.46-7, and similarly elsewhere. For a derived noun, see sigma 1710.
[2] Addendum lacking, Adler reports, in mss AF. It comes from alpha 3496, q.v. (The word means mortify, putrefy, fester, as well (LSJ: web address 1); the meaning in Cratinus is LSJ s.v., II. The form in question here is the present active infinitive of the headword verb.)