Emily Dickinson Lexicon

DITH'Y-RAMB, or DITH-Y-RAMB'US, n. [Gr. διθυραμβος, a title of Bacchus, the signification of which is not settled. See Heder. Lex. and Bochart De Phœn. Col. lib. 1, ca. 18.]

In ancient poetry, a hymn in honor of Bacchus, full of transport and poetical rage. Of this species of writing we have no remains. – Encyc.