dith·y·ramb 
(dĭthĭ-răm′, -rămb′)
(dĭthĭ-răm′, -rămb′)n.
1. A frenzied, impassioned choric hymn and dance of ancient Greece in honor of Dionysus.
2. An irregular poetic expression suggestive of the ancient Greek dithyramb.
3. A wildly enthusiastic speech or piece of writing.
[Latin dīthyrambus, from Greek dīthurambos.]
dith′y·rambic adj.