Abbott-Smith Manual Greek Lexicon
νυχθήμερος (G3574)
1 *† νυχθήμερος , -α, -ον ( νύξ , ἡμέρα , v. B1., § 28, 4), lasting a night and a day ; as subst., ( τὸ ) ν. , a night and a day : II Co 11:25 (pl., Or. Sib. , 8, 203).†
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain