The term 'JOYOUS HYMN' can be broken down into two words, 'JOYOUS' and 'HYMN'. The word 'JOYOUS' is an adjective that means feeling or expressing great pleasure and happiness. The word 'HYMN' is a song of praise or thanksgiving to God or a deity. The crossword solution for this term is 'PAEAN', which is a song or poem expressing joy or triumph. Paeans were originally used in ancient Greece to honor gods and heroes, but they are now used to express joy and gratitude for any occasion.