The primary headword is a masculine noun in the nominative singular, derived from the verb at sigma 1709. For the LSJ entry see web address 1.
[1] Same glossing in Hesychius sigma2837, Synagoge sigma399, Photius sigma857 Theodoridis; see also scholia to (?)Aeschylus, Prometheus Bound 879 and 1045, and (post-Suda) Etymologicum Magnum 737.49.
[2] This secondary lemma is another masculine noun (also in the nominative singular), related to the headword. An etymological relationship is implied between the noun and the participle sfa/zon ('slaying'). Cf. the delightful story about the proverb "even spasms get you a tax-exemption" in kappa 1206 and the following entry, sigma 1711.