Abbott-Smith Manual Greek Lexicon
ψαλμός (G5568)
7 ψαλμός , -οῦ, ὁ ( ψάλλω ), [in LXX chiefly for מִזְמוֹר ;] a striking, twitching with the fingers (Eur., al.), hence, a striking of musical strings (Æsch., al.), and hence in later writers, a sacred song sung to musical accompaniment, a psalm (LXX): I Co 14:26 , Eph 5:19 , Col 3:16 ; of OT psalms, Lk 24:44 , Ac 13:33 ; βίβλος ψαλμῶν , Lk 20:42 , Ac 1:20 .† SYN. : v.s. ὕμνος
G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain