Headword and gloss alike are masculine/feminine accusative singulars or neuter nominative/accusative singulars.
The form of the headword adjective is problematical: dush/nukton here (and possibly as a varia lectio in Hesychius delta2573, though Latte deletes it there); dush/nuston in ps.-Zonaras; dush/nuton (surely rightly: cf. generally LSJ s.v.) in Synagoge delta407, and Photius, Lexicon delta821. Adler also cites the Ambrosian Lexicon (1046) and Ludwich's Anekdota (16.5), without specifying the reading of the headword in these lexica. Hesychius delta2573 has a parallel entry in the masculine nominative singular, and Latte there tentatively identifies its source as Josephus, Jewish War 5.501. (If so, it is neuter.) There are other possibilities in Patristic texts.
[1] See also the scholia to Apollonius Rhodius, Argonautica 502: a(nh/nutos: duskato/rqwtos.