Quick Definition
δευτερόπρωτος, ον Adj second-first
Strong's Definition
second-first, i.e. (specially) a designation of the Sabbath immediately after the Paschal week (being the second after Passover day, and the first of the seven Sabbaths intervening before Pentecost)
Derivation: from G1208 (δεύτερος) and G4413 (πρῶτος);
KJV Usage: second … after the first
Thayer's Greek Lexicon
δευτερό-πρωτος, -ov, second-jirst (cf. δευτερέσχατος second-last, last but one): ἐν σαββάτῳ δευτεροπρώτῳ in Lk. vi. 1 seems to be, the second of the first sabbaths after the feast of the Passover; cf. Redslob in the Intellizenzblatt zur Hall. Lit. Zeit. 1847, N. 70; Ewald, Jahrbb. ἃ. bibl. Wissensch. i. p. 72; [WH. App. ad loc.]. The various opinions of others are reviewed by Meyer [and McClellan] ad loc. and Liibkert in the Stud. und Krit. for 1835, p- 664 sqq. (Eustrat. in vita Eutych. n. 95 calls the first Sunday after Easter δευτεροπρώτην κυριακήν). [But the genuineness of the word is questionable. It is wanting in NBL1, 33, 69 and some other authorities. Hence Tr txt. WH om. the word, L Tr mrg. br. it. Tischendorf, after expunging it in his 2d ed., restored it in his 7th, subsequently put it in brackets, and finally (ed. 8) inserted it again. It is questioned or discarded, by Mey., Bleck, Alf., Weiss (on Mk. p. 101), Holtz., Hilgenf., Volkm., Farrar (Com. ad loc. and Life of Christ i.435), al. For the evidence see Tdf.’s note, and for discussions of it see WH. App. ad loc. ; Scrivener, Intr. p.515 sq. ; Green, “Developed Criticism ” ad loc.]
Mounce Concise Greek Dictionary
Abbott-Smith Greek Lexicon
*† δευτερό-πρωτος, -ον second-first (in what sense, there is no satisfactory explanation. The reading is prob. not original, v. ICC, in l.; DCG, i, 411; ii, 541, 724): Lk 6:1, WH, mg., R, mg.†
Moulton & Milligan — Vocabulary of the Greek NT
δευτερόπρωτος. It is almost superfluous to say that we have found no support for this famous vox γεζ τ (Lk 61), the only interest of which to-day is the curious problem of its early entrance into the text. (Note that W is now added to the MSS rejecting it.) Grimm's superficially parallel δευτερέσχατος “second last, last but one,” is no help: “first but one” is δεύτερος simply. Aekdmpwtos, “one of ten πρῶτοι," is clearly not parallel. One of the most ingenious explanations is that of F. C. Burkitt (Gosp. Hest. p. 8tn.), that the Ba of caBBarwwas repeated at the beginning of a new line, and then Batw expanded as Sevtepo- πρώτῳ--οἴ. ἱβμήνου cited above under δεκαδύο.
Liddell-Scott-Jones — Greek-English Lexicon
δευτερόπρωτος (deuteroprōtos) — second-first. δευτερό-πρωτον σάββατον, τό, probably corrupt in [NT].