νύχιος · nychios — LSJ
nightly
nightly, i.e.
1 doing, by night, as in nightly sleep
of persons, doing a thing by night, ν. καταλέξεται Hes. Op. 523 (v.l.), cf. Th. 991, A. Ag. 588, etc. ; ἀνὴρ δʼ ἐκτέταται ν. as in nightly sleep, S. Ph. 857 (lyr.).
2 belonging to night
belonging to night, ν. φθέγματα Id. Ant. 1147 (lyr.) ; ἐνοπαί, γόοι, E. IT 1277, El. 141 (both lyr.) : in late Prose, ν. θεός Dam. Pr. 273.
3 dark as night, gloomy
of places, dark as night, gloomy, νυχίαν πλάκα A. Pers. 953 (lyr.) ; διʼ ἅλα ν. E. Med. 211 (lyr.) ; ἄντρα Id. Andr. 1224 (lyr.) ; ὑπὸ μέλαθρα νύχια, i.e. into the nether world, Id. Hel. 177 (lyr.) ; χάος Ar. Av. 698 : in later Prose, τὸ τῶν ἄντρων ν. Porph. Antr. 9.