The headword -- quoted from Homer: see next note -- is a neuter noun in (as the second gloss shows) the accusative singular; cf. generally LSJ s.v.
[1] The gloss is the same form as the headword. The headword is similarly glossed in Apollonius' Homeric Lexicon 141.1; Hesychius s.v.; Etymologicum Magnum 709.20 (Kallierges); a scholion ( = D scholia) to Homer, Iliad 8.509 (web address 1), where Hector speaks of Trojan fires whose se/las will reach to heaven; and ps.-Herodian, Partitiones 122.1; see De Stefani, p. 65.
[2] Up to this point the entry is identical in the Synagoge and Photius' Lexicon.
[3] See also sigma 191 (lemma and gloss). [In her critical apparatus, Adler notes that mss AGF lack this cross-reference.]