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): - hymn.
Col 3:16Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymnsG5215 and spiritual songs, singing with grace in your hearts to the Lord.