The Collaborative International Dictionary of English v.0.48:
Dithyrambic \Dith`y*ram"bic\, a. [L. dithyrambicus, Gr. ?: cf. F. dithyrambique.] Pertaining to, or resembling, a dithyramb; wild and boisterous. "Dithyrambic sallies." --Longfellow. -- n. A dithyrambic poem; a dithyramb. [1913 Webster]WordNet (r) 3.0 (2006):
dithyrambic adj 1: of or in the manner of a dithyramb