1) a song in the praise of gods, heroes, conquerors
2) a sacred song, hymn
Part of Speech: noun masculine
Citing in TDNT: 8:489, 1225
Apparently from a simpler (obsolete) form of ὕδέω hudeô (to celebrate; probably akin to G103; compare G5567); a "hymn" or religious ode (one of the Psalms): - hymn.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root ὕμνος; click on the second column to search for that grammatical form of the root ὕμνος; click on the third column to search for that word and grammatical form; click on the total to search for the root ὕμνος.