ᾄδω (Attic form of Ion. and poët. ἀείδω), [in LXX chiefly for שִׁיר ;] to sing, __(a) intrans., with dative (MM, VGT, see word), of praise to God: Refs Eph.5:19, Col.3:16 ; __(b) trans., with cogn. accusative: ᾠδὴν, Refs Rev.5:9 14:3 15:3. † (AS)
Apparently from a simpler (obsolete) form of ὕδέω hudeō (to celebrate; probably akin to G103; compare G5567); a “hymn” or religious ode (one of the Psalms)
KJV Usage: hymn.
From G103; a chant or “ode” (the general term for any words sung; while G5215 denotes especially a religious metrical composition, and G5568 still more specifically a Hebrew cantillation