Quick Definition
twenty-four hours
Strong's Definition
a day-and-night, i.e. full day of twenty-four hours
Derivation: from G3571 (νύξ) and G2250 (ἡμέρα);
KJV Usage: night and day
Thayer's Greek Lexicon
νυχθήμερον, νυχθημερου, τό (νύξ and ἡμέρα), a night and a day, the space of twenty-four hours: 2Co_11:25. (Alex. Aphr.; Geoponica) Cf. Sturz, De dial. Mac. etc., p. 186; (Sophocles Lexicon, under the word; cf. Winer's Grammar, 25).
Mounce Concise Greek Dictionary
νυχθήμερον ny chthēmeron 1x
a day and night, twenty-four hours, 2Co_11:25
Abbott-Smith Greek Lexicon
*† νυχθήμερος , -α , -ον
( < νύξ , ἡμέρα , v. B1., § 28, 4),
lasting a night and a day; as subst ., (τὸ ) ν ., a night and a day: 2Co_11:25 ( pl ., Or. Sib., 8, 203).†
Moulton & Milligan — Vocabulary of the Greek NT
νυχθήμερον [page 432]
With this NT ἅπ . εἰρ . ( 2Co_11:25 ), which is found elsewhere only in late writers (cf. Sturz Dial. Mac. p. 186), we may compare the new νυκτῆμαρ in the Christian letter, addressed perhaps to a Bishop, P Lond 981 .12 (iv/A.D.) (=111. p. 242, Chrest. I. p. 157) περιοδεύομεν καὶ περιπατοῦμεν νυκτῆμαρ , θαρροῦμεν ταῖς προσευχαῖς σου .
Liddell-Scott — Intermediate Greek Lexicon
νυχθήμερον νυχθ-ήμερον, ου, τό, [Etym: ἡμέρα] "a night and a day", NTest.
STEPBible — Tyndale Abridged Greek Lexicon
νυχθήμερος, -α, -ον
(νύξ, ἡμέρα, see B1., § 28, 4),
lasting a night and a day; as subst., (τὸ) ν., a night and a day: 2Co.11:25 (pl., Or. Sib., 8, 203).†
(AS)