Source : Webster's Revised Unabridged Dictionary (1913)

Choral \Cho"ral\, n. (Mus.)
   A hymn tune; a simple sacred tune, sung in unison by the
   congregation; as, the Lutheran chorals. [Sometimes written
   {chorale}.]

Source : WordNet®

chorale
     n : a stately Protestant (especially Lutheran) hymn tune [syn: {choral}]