Quick Definition
dawn
Strong's Definition
relating to the dawn, i.e. matutinal (as an epithet of Venus, especially brilliant in the early day)
Derivation: from G3722 (ὄρθρος);
KJV Usage: morning
Thayer's Greek Lexicon
ὀρθρινός, ὀρθρινή ὀρθρινον (from ὄρθρος; cf. ἡμερινός, ἑσπερινός, ὀπωρινός, πρωϊνός a poetic (Anth.) and later form for ὄρθριος (see Lob. ad Phryn., p. 51; Sturz, De dial. Maced. et Alex., p. 186; (Winers Grammar, 25)), early: Rev_22:16 Rec.; Luk_24:22 L T Tr WH. (Hos_6:4; Wis_11:23 (22).)
Mounce Concise Greek Dictionary
ὀρθρινός orthrinos 1x
a later form of ὄρθριος , of or belonging to the morning, morning, Luk_24:22
Abbott-Smith Greek Lexicon
† ὀρθρινός , -ή , -όν
( < ὄρθρος ),
[in LXX : Hos_6:4 ; Hos_13:3 ( H7925 hi .), Hag_2:14 , Wis_11:22 * ;]
late form of ὄρθριος ( q.v. ), early: Luk_24:22 .†
Moulton & Milligan — Vocabulary of the Greek NT
ὀρθρινός [page 457]
This late form for ὄρθριος (see s.v. ὄρθριος ), is condemned by the Atticists (Lob. Phryn. p. 51). In the NT it is confined to Luk_24:22 (cf. Rev_22:16 TR), but is found quater in the LXX.
Liddell-Scott — Intermediate Greek Lexicon
ὀρθρινός ὀρθρι^νός, ή, όν [Etym: ὄρθρος] [Etym: = ὄρθριος, Anth. , Luc. ]
STEPBible — Tyndale Abridged Greek Lexicon
ὀρθρινός, -ή, -όν
(ὄρθρος), [in LXX: Hos.6:4 13:3 (שָׁכַם hi.), Hag.2:14, Wis.11:22 * ;]
late form of ὄρθριος (which see), early: Luk.24:22.†
(AS)