Quick Definition
a harp
Strong's Definition
a lyre
Derivation: of uncertain affinity;
KJV Usage: harp
Thayer's Greek Lexicon
κιθάρα, κιθάρας, ἡ, a harp (cf. Stainer, Music of the Bible, chapter iv.; B. D., under the word ): 1Co_14:7; Rev_5:8; Rev_14:2; τοῦ Θεοῦ, to which the praises of God are sung in heaven, Rev_15:2; cf. Winers Grammar, § 36, 3 b. (From Homer h. Merc., Herodotus on.)
Mounce Concise Greek Dictionary
κιθάρα kithara 4x
a lyre, harp, 1Co_14:7 ; Rev_5:8 ; Rev_14:2 ; Rev_15:2
Abbott-Smith Greek Lexicon
κιθάρα , -ας , ἡ ,
[in LXX chiefly for H3658 , freq . in Psa_33:2 , al. ); and in ( Dan_3:5 , al. ) for H7030 , itself a transliteration of κίθαρις , the Homeric form of κ . ( cf. CB, Dn., lviii);] a lyre, harp: 1Co_14:7 , Rev_5:8 ; Rev_14:2 ; Rev_15:2 .†
Liddell-Scott — Intermediate Greek Lexicon
κιθάρα the Lat. cithara (whence "guitar)", a kind of "lyre or lute", Hhymn. , Hdt. , attic: —it was of triangular shape, with seven strings, Eur. Cf. κι^θα^ρίζω
STEPBible — Tyndale Abridged Greek Lexicon
κιθάρα, -ας, ἡ
[in LXX chiefly for כִּנּוֹר, frequently in Psa.33:2, al.); and in (Dan.3:5, al.) for קִיתָרֹס, itself a transliteration of κίθαρις, the Homeric form of κ. (cf. CB, Dn., lviii) ;]
a lyre, harp: 1Co.14:7, Rev.5:8 14:2 15:2.†
(AS)