Lewis & Short

dīthyrambus, i, m., = διθύραμβος, a dithyramb, dithyrambic poem. Orig. in honor of Bacchus, but afterwards also of other gods; cf. Lidd. and Scott, sub voce διθύραμβος, Cic. de Or. 3, 48, 145; Hor. C. 4, 2, 10; Mart. Cap. 5, § 519.