The Collaborative International Dictionary
Rhopalic
Rhopalic \Rho*pal"ic\, a. [Gr. ???? club-shaped; fr. ??? a club: cf. F. rhopalique.] (Pros.) Applied to a line or verse in which each successive word has one more syllable than the preceding.
Wiktionary
rhopalic
a. (context poetry rhetoric English) Having each successive word longer by a letter or syllable.